diff --git a/.gitignore b/.gitignore
index 205f4f1c86..377d71685e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,6 +4,9 @@
 .DS_Store
 .AppleDouble
 .LSOverride
+env/
+*.wav
+.env
 
 # Icon must end with two \r
 Icon
@@ -200,3 +203,4 @@ bundle/
 webpack-stats.json
 
 .vscode
+local.env
diff --git a/app/api/filters.py b/app/api/filters.py
index 1efbc44888..c4b56e0fab 100644
--- a/app/api/filters.py
+++ b/app/api/filters.py
@@ -1,13 +1,19 @@
 from django.db.models import Count, Q
-from django_filters.rest_framework import FilterSet, BooleanFilter
+from django_filters.rest_framework import FilterSet, BooleanFilter, NumberFilter
 
-from .models import Document
+from .models import Document, ConversationItem
 
 
 class DocumentFilter(FilterSet):
     seq_annotations__isnull = BooleanFilter(field_name='seq_annotations', method='filter_annotations')
     doc_annotations__isnull = BooleanFilter(field_name='doc_annotations', method='filter_annotations')
     seq2seq_annotations__isnull = BooleanFilter(field_name='seq2seq_annotations', method='filter_annotations')
+    conversation = NumberFilter(method='filter_conversation')
+
+    def filter_conversation(self, queryset, name, value):
+        if value:
+            return queryset.filter(conversationitem__conversation=value)
+        return queryset
 
     def filter_annotations(self, queryset, field_name, value):
         queryset = queryset.annotate(num_annotations=
@@ -24,6 +30,6 @@ def filter_annotations(self, queryset, field_name, value):
 
     class Meta:
         model = Document
-        fields = ('project', 'text', 'meta', 'created_at', 'updated_at',
+        fields = ('project', 'conversation', 'text', 'meta', 'created_at', 'updated_at',
                   'doc_annotations__label__id', 'seq_annotations__label__id',
                   'doc_annotations__isnull', 'seq_annotations__isnull', 'seq2seq_annotations__isnull')
diff --git a/app/api/migrations/0002_auto_20191218_0134.py b/app/api/migrations/0002_auto_20191218_0134.py
new file mode 100644
index 0000000000..55629fc206
--- /dev/null
+++ b/app/api/migrations/0002_auto_20191218_0134.py
@@ -0,0 +1,47 @@
+# Generated by Django 2.1.11 on 2019-12-18 01:34
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('api', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Conversation',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('meta', models.TextField(default='{}')),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('updated_at', models.DateTimeField(auto_now=True)),
+                ('audio_url', models.TextField(default='')),
+                ('audio_file', models.FileField(upload_to='')),
+                ('documents', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='conversation', to='api.Document')),
+            ],
+        ),
+        migrations.CreateModel(
+            name='ConversationsProject',
+            fields=[
+                ('project_ptr', models.OneToOneField(auto_created=True, on_delete=django.db.models.deletion.CASCADE, parent_link=True, primary_key=True, serialize=False, to='api.Project')),
+            ],
+            options={
+                'abstract': False,
+                'base_manager_name': 'objects',
+            },
+            bases=('api.project',),
+        ),
+        migrations.AlterField(
+            model_name='project',
+            name='project_type',
+            field=models.CharField(choices=[('DocumentClassification', 'document classification'), ('SequenceLabeling', 'sequence labeling'), ('Seq2seq', 'sequence to sequence'), ('Conversations', 'conversations validation and labelling')], max_length=30),
+        ),
+        migrations.AddField(
+            model_name='conversation',
+            name='project',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='conversations', to='api.ConversationsProject'),
+        ),
+    ]
diff --git a/app/api/migrations/0003_auto_20191218_0203.py b/app/api/migrations/0003_auto_20191218_0203.py
new file mode 100644
index 0000000000..f8fb1e8661
--- /dev/null
+++ b/app/api/migrations/0003_auto_20191218_0203.py
@@ -0,0 +1,22 @@
+# Generated by Django 2.1.11 on 2019-12-18 02:03
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('api', '0002_auto_20191218_0134'),
+    ]
+
+    operations = [
+        migrations.RenameField(
+            model_name='conversation',
+            old_name='documents',
+            new_name='document',
+        ),
+        migrations.AlterUniqueTogether(
+            name='conversation',
+            unique_together={('project', 'document')},
+        ),
+    ]
diff --git a/app/api/migrations/0004_auto_20191218_0244.py b/app/api/migrations/0004_auto_20191218_0244.py
new file mode 100644
index 0000000000..07dbf2b034
--- /dev/null
+++ b/app/api/migrations/0004_auto_20191218_0244.py
@@ -0,0 +1,36 @@
+# Generated by Django 2.1.11 on 2019-12-18 02:44
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('api', '0003_auto_20191218_0203'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='ConversationItem',
+            fields=[
+                ('document_ptr', models.OneToOneField(auto_created=True, on_delete=django.db.models.deletion.CASCADE, parent_link=True, primary_key=True, serialize=False, to='api.Document')),
+                ('start_timestamp', models.TimeField()),
+                ('end_timestamp', models.TimeField()),
+            ],
+            bases=('api.document',),
+        ),
+        migrations.AlterUniqueTogether(
+            name='conversation',
+            unique_together=set(),
+        ),
+        migrations.AddField(
+            model_name='conversationitem',
+            name='conversation',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='conversation_item', to='api.Conversation'),
+        ),
+        migrations.RemoveField(
+            model_name='conversation',
+            name='document',
+        ),
+    ]
diff --git a/app/api/migrations/0005_auto_20191218_1704.py b/app/api/migrations/0005_auto_20191218_1704.py
new file mode 100644
index 0000000000..ac3abda986
--- /dev/null
+++ b/app/api/migrations/0005_auto_20191218_1704.py
@@ -0,0 +1,60 @@
+# Generated by Django 2.1.11 on 2019-12-18 17:04
+
+from django.db import migrations, models
+import django.db.models.deletion
+import django.utils.timezone
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('contenttypes', '0002_remove_content_type_name'),
+        ('api', '0004_auto_20191218_0244'),
+    ]
+
+    operations = [
+        migrations.AlterModelOptions(
+            name='conversationitem',
+            options={'base_manager_name': 'objects'},
+        ),
+        migrations.AlterModelOptions(
+            name='document',
+            options={'base_manager_name': 'objects'},
+        ),
+        migrations.RemoveField(
+            model_name='conversationitem',
+            name='end_timestamp',
+        ),
+        migrations.RemoveField(
+            model_name='conversationitem',
+            name='start_timestamp',
+        ),
+        migrations.AddField(
+            model_name='conversationitem',
+            name='end_time',
+            field=models.FloatField(default=0),
+            preserve_default=False,
+        ),
+        migrations.AddField(
+            model_name='conversationitem',
+            name='machine_text',
+            field=models.TextField(default=''),
+            preserve_default=False,
+        ),
+        migrations.AddField(
+            model_name='conversationitem',
+            name='start_time',
+            field=models.FloatField(default=0),
+            preserve_default=False,
+        ),
+        migrations.AddField(
+            model_name='document',
+            name='polymorphic_ctype',
+            field=models.ForeignKey(editable=False, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='polymorphic_api.document_set+', to='contenttypes.ContentType'),
+        ),
+        migrations.AlterField(
+            model_name='conversationitem',
+            name='conversation',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='conversation_items', to='api.Conversation'),
+        ),
+    ]
diff --git a/app/api/migrations/0006_auto_20191218_1740.py b/app/api/migrations/0006_auto_20191218_1740.py
new file mode 100644
index 0000000000..d45bf1ecc1
--- /dev/null
+++ b/app/api/migrations/0006_auto_20191218_1740.py
@@ -0,0 +1,47 @@
+# Generated by Django 2.1.11 on 2019-12-18 17:40
+
+from django.conf import settings
+import django.contrib.postgres.fields.jsonb
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+        ('api', '0005_auto_20191218_1704'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='ConversationItemAnnotation',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('prob', models.FloatField(default=0.0)),
+                ('manual', models.BooleanField(default=False)),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('updated_at', models.DateTimeField(auto_now=True)),
+                ('text', models.TextField()),
+                ('start_offset', models.IntegerField()),
+                ('end_offset', models.IntegerField()),
+                ('document', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='conversation_annotations', to='api.Document')),
+                ('label', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='api.Label')),
+                ('user', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to=settings.AUTH_USER_MODEL)),
+            ],
+        ),
+        migrations.AlterField(
+            model_name='conversation',
+            name='audio_file',
+            field=models.FileField(upload_to='audio'),
+        ),
+        migrations.AlterField(
+            model_name='conversation',
+            name='meta',
+            field=django.contrib.postgres.fields.jsonb.JSONField(blank=True),
+        ),
+        migrations.AlterUniqueTogether(
+            name='conversationitemannotation',
+            unique_together={('start_offset', 'end_offset', 'label', 'document')},
+        ),
+    ]
diff --git a/app/api/migrations/0007_conversationitem_text_validated.py b/app/api/migrations/0007_conversationitem_text_validated.py
new file mode 100644
index 0000000000..5a498d61b2
--- /dev/null
+++ b/app/api/migrations/0007_conversationitem_text_validated.py
@@ -0,0 +1,18 @@
+# Generated by Django 2.1.11 on 2019-12-19 00:05
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('api', '0006_auto_20191218_1740'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='conversationitem',
+            name='text_validated',
+            field=models.BooleanField(default=False),
+        ),
+    ]
diff --git a/app/api/migrations/0008_auto_20191220_1329.py b/app/api/migrations/0008_auto_20191220_1329.py
new file mode 100644
index 0000000000..1107ca47ba
--- /dev/null
+++ b/app/api/migrations/0008_auto_20191220_1329.py
@@ -0,0 +1,18 @@
+# Generated by Django 2.1.11 on 2019-12-20 13:29
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('api', '0007_conversationitem_text_validated'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='conversation',
+            name='meta',
+            field=models.TextField(default='{}'),
+        ),
+    ]
diff --git a/app/api/migrations/0009_auto_20200113_0950.py b/app/api/migrations/0009_auto_20200113_0950.py
new file mode 100644
index 0000000000..aa9f5d3bdf
--- /dev/null
+++ b/app/api/migrations/0009_auto_20200113_0950.py
@@ -0,0 +1,23 @@
+# Generated by Django 2.1.11 on 2020-01-13 09:50
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('api', '0008_auto_20191220_1329'),
+    ]
+
+    operations = [
+        migrations.RenameField(
+            model_name='conversationitem',
+            old_name='text_validated',
+            new_name='is_validated',
+        ),
+        migrations.AddField(
+            model_name='conversationitem',
+            name='is_ignored',
+            field=models.BooleanField(default=False),
+        ),
+    ]
diff --git a/app/api/models.py b/app/api/models.py
index 697ceb0f02..d86c32b731 100644
--- a/app/api/models.py
+++ b/app/api/models.py
@@ -5,6 +5,7 @@
 from django.db.models.signals import post_save, pre_delete
 from django.urls import reverse
 from django.conf import settings
+from django.contrib.postgres.fields import JSONField
 from django.contrib.auth.models import User
 from django.contrib.staticfiles.storage import staticfiles_storage
 from django.core.exceptions import ValidationError
@@ -15,10 +16,12 @@
 DOCUMENT_CLASSIFICATION = 'DocumentClassification'
 SEQUENCE_LABELING = 'SequenceLabeling'
 SEQ2SEQ = 'Seq2seq'
+CONVERSATIONS = 'Conversations'
 PROJECT_CHOICES = (
     (DOCUMENT_CLASSIFICATION, 'document classification'),
     (SEQUENCE_LABELING, 'sequence labeling'),
     (SEQ2SEQ, 'sequence to sequence'),
+    (CONVERSATIONS, 'conversations validation and labelling'),
 )
 
 
@@ -143,6 +146,33 @@ def get_storage(self, data):
         return Seq2seqStorage(data, self)
 
 
+class ConversationsProject(Project):
+
+    @property
+    def image(self):
+        return staticfiles_storage.url('assets/images/cats/seq2seq.jpg')
+
+    def get_bundle_name(self):
+        return 'conversations'
+
+    def get_bundle_name_upload(self):
+        return 'upload_conversations'
+ 
+    def get_bundle_name_download(self):
+        return 'download_conversations'
+
+    def get_annotation_serializer(self):
+        from .serializers import ConversationItemAnnotationSerializer
+        return ConversationItemAnnotationSerializer
+
+    def get_annotation_class(self):
+        return ConversationItemAnnotation
+
+    def get_storage(self, data):
+        from .utils import ConversationStorage
+        return ConversationStorage(data, self)
+
+
 class Label(models.Model):
     PREFIX_KEYS = (
         ('ctrl', 'ctrl'),
@@ -184,7 +214,7 @@ class Meta:
         )
 
 
-class Document(models.Model):
+class Document(PolymorphicModel):
     text = models.TextField()
     project = models.ForeignKey(Project, related_name='documents', on_delete=models.CASCADE)
     meta = models.TextField(default='{}')
@@ -196,6 +226,24 @@ def __str__(self):
         return self.text[:50]
 
 
+class Conversation(models.Model):
+    project = models.ForeignKey(ConversationsProject, related_name='conversations', on_delete=models.CASCADE)
+    meta = models.TextField(default='{}', null=False)
+    created_at = models.DateTimeField(auto_now_add=True)
+    updated_at = models.DateTimeField(auto_now=True)
+    audio_url = models.TextField(default='', null=False)
+    audio_file = models.FileField(upload_to='audio', null=False, blank=False)
+
+
+class ConversationItem(Document):
+    conversation = models.ForeignKey(Conversation, related_name='conversation_items', on_delete=models.CASCADE)
+    start_time = models.FloatField()
+    end_time = models.FloatField()
+    machine_text = models.TextField()
+    is_validated = models.BooleanField(default=False)
+    is_ignored = models.BooleanField(default=False)
+
+
 class Annotation(models.Model):
     objects = AnnotationManager()
 
@@ -241,6 +289,15 @@ class Seq2seqAnnotation(Annotation):
     class Meta:
         unique_together = ('document', 'user', 'text')
 
+class ConversationItemAnnotation(Annotation):
+    document = models.ForeignKey(Document, related_name='conversation_annotations',on_delete=models.CASCADE)
+    label = models.ForeignKey(Label, on_delete=models.CASCADE) 
+    text = models.TextField()
+    start_offset = models.IntegerField()
+    end_offset = models.IntegerField()   
+
+    class Meta:
+        unique_together = ('start_offset', 'end_offset', 'label', 'document')
 
 class Role(models.Model):
     name = models.CharField(max_length=100, unique=True)
diff --git a/app/api/serializers.py b/app/api/serializers.py
index eaa2af2cf7..419ba608c1 100644
--- a/app/api/serializers.py
+++ b/app/api/serializers.py
@@ -1,14 +1,17 @@
+import requests, uuid
 from django.conf import settings
 from django.contrib.auth import get_user_model
 from django.shortcuts import get_object_or_404
+from django.core.files.base import ContentFile
 from rest_framework import serializers
 from rest_polymorphic.serializers import PolymorphicSerializer
 from rest_framework.exceptions import ValidationError
+import json
 
 
-from .models import Label, Project, Document, RoleMapping, Role
-from .models import TextClassificationProject, SequenceLabelingProject, Seq2seqProject
-from .models import DocumentAnnotation, SequenceAnnotation, Seq2seqAnnotation
+from .models import Label, Project, Document, RoleMapping, Role, Conversation, ConversationItem
+from .models import TextClassificationProject, SequenceLabelingProject, Seq2seqProject, ConversationsProject
+from .models import DocumentAnnotation, SequenceAnnotation, Seq2seqAnnotation, ConversationItemAnnotation
 
 
 class UserSerializer(serializers.ModelSerializer):
@@ -137,12 +140,93 @@ class Meta:
         read_only_fields = ('image', 'updated_at', 'users', 'current_users_role')
 
 
+class ConversationsProjectSerializer(ProjectSerializer):
+
+    class Meta:
+        model = ConversationsProject
+        fields = ('id', 'name', 'description', 'guideline', 'users', 'current_users_role', 'project_type', 'image',
+                  'updated_at', 'randomize_document_order')
+        read_only_fields = ('image', 'updated_at', 'users', 'current_users_role')
+
+
+class ConversationItemSerializer(DocumentSerializer):
+    startTimeInSeconds = serializers.FloatField(source='start_time')
+    endTimeInSeconds = serializers.FloatField(source='end_time')
+    machineTranscription = serializers.CharField(source='machine_text', allow_blank=True)
+    humanTranscription = serializers.CharField(source='text', allow_blank=True)
+    isValidated = serializers.BooleanField(source='is_validated', default=False)
+    isIgnored = serializers.BooleanField(source='is_ignored', default=False)
+    conversation = serializers.PrimaryKeyRelatedField(read_only=True)
+    metadata = serializers.JSONField(source='meta', required=False)
+
+    class Meta:
+        model = ConversationItem
+        fields = ('id', 'startTimeInSeconds', 'endTimeInSeconds', 'machineTranscription', 'humanTranscription', 'metadata', 'isValidated', 'isIgnored', 'conversation', 'annotations', 'annotation_approver')
+
+
+class DocumentPolymorphicSerializer(PolymorphicSerializer):
+    model_serializer_mapping = {
+        Document: DocumentSerializer,
+        ConversationItem: ConversationItemSerializer,
+    }
+
+
+class ConversationSerializer(serializers.ModelSerializer):
+    audioFileUrl = serializers.URLField(source='audio_url', write_only=True)
+    metadata = serializers.JSONField(source='meta', required=False)
+    sentences = ConversationItemSerializer(source='conversation_items', many=True, write_only=True)
+    # @FIXME(Jeremie): Hack to be able to save file from audioUrl, a new field shoud be created
+    # following this example : https://github.com/Hipo/drf-extra-fields#base64filefield
+    audioFile = serializers.FileField(source='audio_file', required=False)
+
+    def create(self, validated_data):
+        # As conversation item inherit from documents we need to set the project id
+        if 'conversation_items' in validated_data.keys():
+            validated_data.update({'conversation_items': [
+                {'project': validated_data.get('project'), **item } for item in validated_data.get('conversation_items') ]})
+
+        if 'meta' in validated_data.keys():
+            validated_data.update({
+                'meta': json.dumps(validated_data.get('meta'))
+            })
+
+        many_to_many = {}
+        for field_name in ['conversation_items']:
+            if field_name in validated_data:
+                many_to_many[field_name] = validated_data.pop(field_name)
+
+        instance = self.Meta.model.objects.create(**validated_data)
+
+        # Save many-to-many relationships after the instance is created.
+        if many_to_many:
+            for field_name, value in many_to_many.items():
+                if type(value) is list:
+                    for related in value:
+                        field = getattr(instance, field_name)
+                        field.create(**related)
+
+        return instance
+
+    def validate(self, data):
+        if data.get('audio_url'):
+            # @FIXME(Jeremie): This will probably not scale as this is sync and blocking call
+            res = requests.get(data.get('audio_url'))
+            if res.status_code is 200:
+                data['audio_file'] = ContentFile(res.content, name=f'{uuid.uuid4()}.wav')
+        return data
+
+    class Meta:
+        model = Conversation
+        fields = ('id', 'audioFileUrl', 'metadata', 'audioFile', 'sentences')
+
+
 class ProjectPolymorphicSerializer(PolymorphicSerializer):
     model_serializer_mapping = {
         Project: ProjectSerializer,
         TextClassificationProject: TextClassificationProjectSerializer,
         SequenceLabelingProject: SequenceLabelingProjectSerializer,
-        Seq2seqProject: Seq2seqProjectSerializer
+        Seq2seqProject: Seq2seqProjectSerializer,
+        ConversationsProject: ConversationsProjectSerializer,
     }
 
 
@@ -188,6 +272,14 @@ class Meta:
         read_only_fields = ('user',)
 
 
+class ConversationItemAnnotationSerializer(DocumentAnnotationSerializer):
+    
+    class Meta:
+        model = ConversationItemAnnotation
+        fields = ('id', 'prob', 'label', 'start_offset', 'end_offset', 'user', 'document')
+        read_only_fields = ('user', )
+
+
 class RoleSerializer(serializers.ModelSerializer):
     class Meta:
         model = Role
diff --git a/app/api/urls.py b/app/api/urls.py
index b65d87a00b..6255a29fa3 100644
--- a/app/api/urls.py
+++ b/app/api/urls.py
@@ -4,7 +4,8 @@
 
 from .views import Me, Features, Users
 from .views import ProjectList, ProjectDetail
-from .views import LabelList, LabelDetail, ApproveLabelsAPI
+from .views import LabelList, LabelDetail, ApproveLabelsAPI, ApproveCorrectionsAPI
+from .views import ConversationList
 from .views import DocumentList, DocumentDetail
 from .views import AnnotationList, AnnotationDetail
 from .views import TextUploadAPI, TextDownloadAPI, CloudUploadAPI
@@ -24,6 +25,13 @@
          StatisticsAPI.as_view(), name='statistics'),
     path('projects/<int:project_id>/labels',
          LabelList.as_view(), name='label_list'),
+
+     path('projects/<int:project_id>/conversations',
+         ConversationList.as_view(), name='conversation_list'),
+     
+     path('projects/<int:project_id>/docs/<int:doc_id>/approve-correction',
+         ApproveCorrectionsAPI.as_view(), name='approve_correction'),
+
     path('projects/<int:project_id>/labels/<int:label_id>',
          LabelDetail.as_view(), name='label_detail'),
     path('projects/<int:project_id>/docs',
diff --git a/app/api/utils.py b/app/api/utils.py
index 396a66b4b4..aac77d0f0c 100644
--- a/app/api/utils.py
+++ b/app/api/utils.py
@@ -16,7 +16,7 @@
 
 from .exceptions import FileParseException
 from .models import Label
-from .serializers import DocumentSerializer, LabelSerializer
+from .serializers import DocumentSerializer, LabelSerializer, ConversationSerializer
 
 
 def extract_label(tag):
@@ -217,6 +217,57 @@ def make_annotations(cls, docs, labels):
         return annotations
 
 
+class ConversationStorage(BaseStorage):
+    """Store json for speech2text with conversation.
+    
+    The format is as follows:
+    {"audioUrl": "https://.....wav", "metadata": { "service": "AzureSpeechAPI", "duration": 30 },"sentences": [{  }, { ... }, ...]}
+    ...
+    """
+    @transaction.atomic
+    def save(self, user):
+        saved_labels = {label.text: label for label in self.project.labels.all()}
+        for data in self.data:
+            conversations = self.save_conversations(data)
+            labels = self.extract_label(data)
+            unique_labels = self.extract_unique_labels(labels)
+            unique_labels = self.exclude_created_labels(unique_labels, saved_labels)
+            unique_labels = self.to_serializer_format(unique_labels, saved_labels)
+            new_labels = self.save_label(unique_labels)
+            saved_labels = self.update_saved_labels(saved_labels, new_labels)
+            annotations = self.make_annotations(conversations, labels, saved_labels)
+            self.save_annotation(annotations, user)
+
+
+    def save_conversations(self, data):
+        serializer = ConversationSerializer(data=data, many=True)
+        serializer.is_valid(raise_exception=True)
+        conversation = serializer.save(project=self.project)
+        return conversation
+
+    @classmethod
+    def extract_unique_labels(cls, labels):
+        return set([label for _, _, label in itertools.chain(*labels)])
+
+    @classmethod
+    def extract_label(cls, data):
+        return [sentence.get('labels', []) for conversation in data for sentence in conversation.get('sentences', [])]
+
+    @classmethod
+    def make_annotations(cls, conversations, labels, saved_labels):
+        sentences = [sentence for conversation in conversations for sentence in conversation.conversation_items.all()]
+        annotations = []
+        for sentence, spans in zip(sentences, labels):
+            for span in spans:
+                start_offset, end_offset, name = span
+                label = saved_labels[name]
+                annotations.append({'document': sentence.id,
+                                    'label': label.id,
+                                    'start_offset': start_offset,
+                                    'end_offset': end_offset})
+        return annotations
+        
+
 class FileParser(object):
 
     def parse(self, file):
diff --git a/app/api/views.py b/app/api/views.py
index 4b31bcd8b6..be300d7d3a 100644
--- a/app/api/views.py
+++ b/app/api/views.py
@@ -14,9 +14,9 @@
 from rest_framework_csv.renderers import CSVRenderer
 
 from .filters import DocumentFilter
-from .models import Project, Label, Document, RoleMapping, Role
+from .models import Project, Label, Document, RoleMapping, Role, Conversation
 from .permissions import IsProjectAdmin, IsAnnotatorAndReadOnly, IsAnnotator, IsAnnotationApproverAndReadOnly, IsOwnAnnotation, IsAnnotationApprover
-from .serializers import ProjectSerializer, LabelSerializer, DocumentSerializer, UserSerializer
+from .serializers import ProjectSerializer, LabelSerializer, DocumentSerializer, UserSerializer, ConversationSerializer, DocumentPolymorphicSerializer
 from .serializers import ProjectPolymorphicSerializer, RoleMappingSerializer, RoleSerializer
 from .utils import CSVParser, ExcelParser, JSONParser, PlainTextParser, CoNLLParser, iterable_to_io
 from .utils import JSONLRenderer
@@ -70,15 +70,16 @@ def get(self, request, *args, **kwargs):
         p = get_object_or_404(Project, pk=self.kwargs['project_id'])
 
         include = set(request.GET.getlist('include'))
+        conversation = request.GET.get('conversation')
         response = {}
-
+        
         if not include or 'label' in include or 'user' in include:
             label_count, user_count = self.label_per_data(p)
             response['label'] = label_count
             response['user'] = user_count
 
         if not include or 'total' in include or 'remaining' in include:
-            progress = self.progress(project=p)
+            progress = self.progress(project=p, conversation=conversation)
             response.update(progress)
 
         if include:
@@ -86,8 +87,11 @@ def get(self, request, *args, **kwargs):
 
         return Response(response)
 
-    def progress(self, project):
-        docs = project.documents
+    def progress(self, project, conversation=None):
+        if conversation:
+            docs = project.conversations.get(pk=conversation).conversation_items
+        else:
+            docs = project.documents
         annotation_class = project.get_annotation_class()
         total = docs.count()
         done = annotation_class.objects.filter(document_id__in=docs.all(),
@@ -111,6 +115,20 @@ def post(self, request, *args, **kwargs):
         document.save()
         return Response(DocumentSerializer(document).data)
 
+class ApproveCorrectionsAPI(APIView):
+    permission_classes = [IsAuthenticated & (IsAnnotationApprover | IsProjectAdmin)]
+
+    def post(self, request, *args, **kwargs):
+        corrected = self.request.data.get('corrected')
+        document = get_object_or_404(Document, pk=self.kwargs['doc_id'])
+        document.text_validated = corrected
+        if (corrected):
+            # We don't want to change the text if someones clicks "correct again"
+            humanText = self.request.data.get('correctedText')
+            document.text = humanText
+        document.save()
+        return Response(DocumentSerializer(document).data)
+
 
 class LabelList(generics.ListCreateAPIView):
     serializer_class = LabelSerializer
@@ -125,6 +143,15 @@ def perform_create(self, serializer):
         project = get_object_or_404(Project, pk=self.kwargs['project_id'])
         serializer.save(project=project)
 
+class ConversationList(generics.ListCreateAPIView):
+    serializer_class = ConversationSerializer
+    pagination_class = None
+    permission_classes = [IsAuthenticated & IsInProjectReadOnlyOrAdmin]
+
+    def get_queryset(self):
+        project = get_object_or_404(Project, pk=self.kwargs['project_id'])
+        return project.conversations
+
 
 class LabelDetail(generics.RetrieveUpdateDestroyAPIView):
     queryset = Label.objects.all()
@@ -134,7 +161,7 @@ class LabelDetail(generics.RetrieveUpdateDestroyAPIView):
 
 
 class DocumentList(generics.ListCreateAPIView):
-    serializer_class = DocumentSerializer
+    serializer_class = DocumentPolymorphicSerializer
     filter_backends = (DjangoFilterBackend, filters.SearchFilter, filters.OrderingFilter)
     search_fields = ('text', )
     ordering_fields = ('created_at', 'updated_at', 'doc_annotations__updated_at',
@@ -142,7 +169,7 @@ class DocumentList(generics.ListCreateAPIView):
     filter_class = DocumentFilter
     permission_classes = [IsAuthenticated & IsInProjectReadOnlyOrAdmin]
 
-    def get_queryset(self):
+    def get_queryset(self):        
         project = get_object_or_404(Project, pk=self.kwargs['project_id'])
 
         queryset = project.documents
@@ -158,7 +185,7 @@ def perform_create(self, serializer):
 
 class DocumentDetail(generics.RetrieveUpdateDestroyAPIView):
     queryset = Document.objects.all()
-    serializer_class = DocumentSerializer
+    serializer_class = DocumentPolymorphicSerializer
     lookup_url_kwarg = 'doc_id'
     permission_classes = [IsAuthenticated & IsInProjectReadOnlyOrAdmin]
 
diff --git a/app/app/settings.py b/app/app/settings.py
index c871ff5b25..0d8c8610fc 100644
--- a/app/app/settings.py
+++ b/app/app/settings.py
@@ -123,6 +123,13 @@
     if path.isdir(static_path)
 ]
 
+DEFAULT_FILE_STORAGE = 'storages.backends.azure_storage.AzureStorage'
+AZURE_ACCOUNT_NAME = env('AZURE_ACCOUNT_NAME', None)
+AZURE_ACCOUNT_KEY = env('AZURE_ACCOUNT_KEY', None)
+AZURE_CONTAINER = env('AZURE_CONTAINER', None)
+AZURE_URL_EXPIRATION_SECS=3600
+AZURE_CACHE_CONTROL = "public,max-age=31536000,immutable"
+
 STATICFILES_STORAGE = 'whitenoise.storage.CompressedManifestStaticFilesStorage'
 
 WEBPACK_LOADER = {
@@ -155,6 +162,7 @@
 SOCIAL_AUTH_AZUREAD_TENANT_OAUTH2_KEY = env('OAUTH_AAD_KEY', None)
 SOCIAL_AUTH_AZUREAD_TENANT_OAUTH2_SECRET = env('OAUTH_AAD_SECRET', None)
 SOCIAL_AUTH_AZUREAD_TENANT_OAUTH2_TENANT_ID = env('OAUTH_AAD_TENANT', None)
+SOCIAL_AUTH_AZUREAD_TENANT_OAUTH2_WHITELISTED_DOMAINS = env('OAUTH_AAD_WHITELISTED_DOMAINS', '').split(',')
 AZUREAD_ADMIN_GROUP_ID = env('AZUREAD_ADMIN_GROUP_ID', None)
 
 if AZUREAD_ADMIN_GROUP_ID:
diff --git a/app/server/static/assets/css/annotation.css b/app/server/static/assets/css/annotation.css
index f7f6abf622..8324e39de1 100644
--- a/app/server/static/assets/css/annotation.css
+++ b/app/server/static/assets/css/annotation.css
@@ -23,6 +23,14 @@ body {
   overflow-x: hidden;
 }
 
+.sidebar-scrollable.half-sized {
+  max-height: 45vh;
+}
+
+.hero.is-fullheight {
+  min-height: calc(100vh - 52px);
+}
+
 .messages {
   display: block;
   background-color: #fff;
diff --git a/app/server/static/components/annotationMixin.js b/app/server/static/components/annotationMixin.js
index b1c1d2ddd2..9094cd9e12 100644
--- a/app/server/static/components/annotationMixin.js
+++ b/app/server/static/components/annotationMixin.js
@@ -224,7 +224,7 @@ export default {
 
       HTTP.post(`docs/${document.id}/approve-labels`, { approved }).then((response) => {
         const documents = this.docs.slice();
-        documents[this.pageNumber] = response.data;
+        documents[this.pageNumber].annotation_approver = response.data.annotation_approver;
         this.docs = documents;
       });
     },
diff --git a/app/server/static/components/conversations.pug b/app/server/static/components/conversations.pug
new file mode 100644
index 0000000000..8d24953fd9
--- /dev/null
+++ b/app/server/static/components/conversations.pug
@@ -0,0 +1,211 @@
+div.columns(v-cloak="")
+  aside.column.is-3.aside.hero.is-fullheight
+    div
+
+      div.main.pr20.pl20
+        
+        div
+        | Please select a conversation:
+      
+        div.main.sidebar-scrollable.half-sized
+          a.item(
+            v-for="(conversation, index) in conversations"
+            v-bind:class="{ active: conversation.id === selectedConversationId }"
+            v-on:click="selectedConversationId = conversation.id"
+            href="#"
+          )
+            //- span.icon
+            //-   i.fa.fa-check(v-show="doc.isValidated && !doc.annotation_approver")
+            //-   i.fa.fa-check-double(v-show="doc.isValidated && doc.annotation_approver")
+            span.name {{ parseConversationsTitle(conversation).slice(0, 60) }}...
+
+      div.main.pt0.pb0.pr20.pl20
+        span About {{ count }} results (page {{ paginationPage }} of {{ paginationPages }})
+
+      div.main.pt0.pb0.pr20.pl20
+        div.columns
+          div.column.is-5
+            div.field.has-addons
+              div.control.is-expanded
+                input.input(
+                  v-model="searchQuery"
+                  v-on:keyup.enter="submit"
+                  type="text"
+                  placeholder="Search document"
+                  style="border-right: none; box-shadow: none; -webkit-box-shadow: none;"
+                )
+
+              div.control
+                div.dropdown.is-hoverable
+                  div.dropdown-trigger
+                    button.button(
+                      aria-haspopup="true"
+                      aria-controls="dropdown-menu"
+                      style="border-left: none"
+                    )
+                      span.icon.has-text-grey.pr0
+                        i.fas.fa-angle-down(aria-hidden="true")
+
+                  div.dropdown-menu.pt0#dropdown-menu(role="menu")
+                    div.dropdown-content
+                      a.dropdown-item
+                        label.radio
+                          input(
+                            v-model="picked"
+                            type="radio"
+                            value="all"
+                            checked=""
+                          )
+                          | All
+                      a.dropdown-item
+                        label.radio
+                          input(
+                            v-model="picked"
+                            type="radio"
+                            value="active"
+                          )
+                          | Active
+                      a.dropdown-item
+                        label.radio
+                          input(
+                            v-model="picked"
+                            type="radio"
+                            value="completed"
+                          )
+                          | Completed
+          div.column.is-5
+            div.select
+              select(v-model="ordering")
+                option(value="", disabled, selected) Sort by
+                option(value="created_at") Created : Ascending
+                option(value="-created_at") Created : Descending
+                option(value="updated_at") Updated : Ascending
+                option(value="-updated_at") Updated : Descending
+
+      div.main.sidebar-scrollable.half-sized
+        a.item(
+          v-for="(doc, index) in docs"
+          v-bind:class="{ active: index == pageNumber }"
+          v-bind:data-preview-id="index"
+          v-on:click="pageNumber = index"
+          href="#"
+        )
+          span.icon
+            i.fa.fa-check(v-show="doc.isValidated && !doc.annotation_approver")
+            i.fa.fa-check-double(v-show="doc.isValidated && doc.annotation_approver")
+            i.fas.fa-minus-circle(v-show="doc.isIgnored && !doc.annotation_approver")
+          span.name {{ doc.text.slice(0, 60) }}...
+
+  div.column.is-7.is-offset-1.message.hero.is-fullheight#message-pane
+    div.modal(v-bind:class="{ 'is-active': isAnnotationGuidelineActive }")
+      div.modal-background
+      div.modal-card
+        header.modal-card-head
+          p.modal-card-title Annotation Guideline
+          button.delete(
+            v-on:click="isAnnotationGuidelineActive = !isAnnotationGuidelineActive"
+            aria-label="close"
+          )
+        section.modal-card-body.modal-card-body-footer.content(
+          v-html="compiledMarkdown"
+          style="line-height: 150%"
+        )
+
+    div.modal(v-bind:class="{ 'is-active': isMetadataActive }")
+      div.modal-background
+      div.modal-card
+        header.modal-card-head
+          p.modal-card-title Document Metadata
+          button.delete(
+            v-on:click="isMetadataActive = !isMetadataActive"
+            aria-label="close"
+          )
+        section.modal-card-body.modal-card-body-footer
+          vue-json-pretty(
+            v-bind:data="documentMetadata"
+            v-bind:show-double-quotes="false"
+            v-bind:show-line="false"
+          )
+
+    div.columns.is-multiline.is-gapless.is-mobile.is-vertical-center
+      div.column.is-12 Conversation : 
+        strong {{ parseConversationsTitle(conversation) }}
+      div.column.is-3
+        progress.progress.is-inline-block(
+          v-bind:class="progressColor"
+          v-bind:value="achievement"
+          max="100"
+        ) 30%
+      div.column.is-5
+        span.ml10
+          strong {{ total - remaining }}
+        | /
+        span {{ total }}
+
+      div.column.is-1.has-text-right
+        a.button.tooltip.is-tooltip-bottom(
+          v-if="isAnnotationApprover && documentIsCorrected"
+          v-on:click="approveDocumentAnnotations"
+          v-bind:data-tooltip="documentAnnotationsApprovalTooltip"
+        )
+          span.icon
+            i.fas(v-bind:class="[documentAnnotationsAreApproved ? 'fa-thumbs-down' : 'fa-thumbs-up']")
+      div.column.is-1.has-text-right
+        a.button(v-on:click="isAnnotationGuidelineActive = !isAnnotationGuidelineActive")
+          span.icon
+            i.fas.fa-book
+      div.column.is-1.has-text-right
+        a.button(
+          v-on:click="isMetadataActive = !isMetadataActive && documentMetadata != null"
+          v-bind:disabled="documentMetadata == null"
+          v-bind:title="documentMetadata == null ? 'No document metadata available.' : null"
+        )
+          span.icon
+            i.fas.fa-box
+
+    div.columns
+      div.column
+        block annotation-area
+
+      div.column(v-if="documentMetadata != null && documentMetadata.documentSourceUrl != null")
+        preview(v-bind:url="documentMetadata.documentSourceUrl")
+
+    div.level.mt30
+      div.level-left
+        div.buttons
+          a.button(
+            v-shortkey="{ prev1: ['shift', 'ctrl', 'p'], prev2: ['shift', 'arrowup'], prev3: ['shift', 'arrowleft'] }"
+            v-on:click="prevPagination"
+            v-on:shortkey="prevPagination"
+          )
+            span.icon.tooltip(data-tooltip="Previous page")
+              i.fas.fa-arrow-left
+
+          a.button(
+            v-shortkey="{ prev1: ['ctrl', 'p'], prev2: ['arrowup'], prev3: ['arrowleft'] }"
+            v-on:click="prevPage"
+            v-on:shortkey="prevPage"
+          )
+            span.icon.tooltip(data-tooltip="Previous document")
+              i.fas.fa-chevron-left
+
+      div.level-center
+        span.button.is-static {{ offset + pageNumber + 1 }} / {{ count }}
+
+      div.level-right
+        div.buttons
+          a.button(
+            v-shortkey="{ next1: ['ctrl', 'n'], next2: ['arrowdown'], next3: ['arrowright'] }"
+            v-on:click="nextPage"
+            v-on:shortkey="nextPage"
+          )
+            span.icon.tooltip(data-tooltip="Next document")
+              i.fas.fa-chevron-right
+
+          a.button(
+            v-shortkey="{ next1: ['shift', 'ctrl', 'n'], next2: ['shift', 'arrowdown'], next3: ['shift', 'arrowright'] }"
+            v-on:click="nextPagination"
+            v-on:shortkey="nextPagination"
+          )
+            span.icon.tooltip(data-tooltip="Next page")
+              i.fas.fa-arrow-right
diff --git a/app/server/static/components/conversations.vue b/app/server/static/components/conversations.vue
new file mode 100644
index 0000000000..b09190e212
--- /dev/null
+++ b/app/server/static/components/conversations.vue
@@ -0,0 +1,146 @@
+<template lang="pug">
+extends ./conversations.pug
+
+
+block annotation-area
+  corrector(
+    v-if="docs[pageNumber] && annotations[pageNumber]"
+    :text="docs[pageNumber].text"
+    :doc="docs[pageNumber]"
+    :start="docs[pageNumber].startTimeInSeconds"
+    :end="docs[pageNumber].endTimeInSeconds"
+    :audioFile="conversation.audioFile"
+    :labels="labels"
+    :entity-positions="annotations[pageNumber]"
+    :search-query="searchQuery"
+    :key="selectedConversationId"
+    @dataChanged="getCorrectedText"
+    @remove-label="removeLabel"
+    @ignore-document="ignoreDocument"
+    @approve-document-correction="approveDocumentCorrection"
+    @approve-document-annotations="approveDocumentAnnotations"
+    @add-label="addLabel"
+    @update-label="updateLabel"
+    ref="corrector"
+  )
+
+</template>
+
+<style scoped>
+.card-header-title {
+  padding: 1.5rem;
+}
+</style>
+
+<script>
+import annotationMixin from './annotationMixin';
+import Corrector from './corrector.vue';
+
+import HTTP from './http';
+
+export default {
+
+  data() {
+    return {
+      conversations: [],
+      selectedConversationId: 0,
+      correctedText: '',
+      ordering: 'created_at',
+    };
+  },
+  components: { Corrector },
+  mixins: [annotationMixin],
+  computed: {
+    conversation() {
+      return this.conversations.find(c => c.id === this.selectedConversationId);
+    },
+    documentIsCorrected() {
+      const document = this.docs[this.pageNumber];
+      return document != null && document.isValidated;
+    },
+    approveDocumentCorrectionTooltip() {
+      return this.documentIsCorrected
+        ? 'Correction done, click to correct transcript'
+        : 'Click to correct transcript';
+    },
+  },
+  methods: {
+    addLabel(annotation) {
+      const docId = this.docs[this.pageNumber].id;
+      HTTP.post(`docs/${docId}/annotations`, annotation).then((response) => {
+        this.annotations[this.pageNumber].push(response.data);
+      });
+    },
+    async updateLabel(annotation) {
+      const docId = this.docs[this.pageNumber].id;
+      await HTTP.put(`docs/${docId}/annotations/${annotation.id}`, annotation);
+    },
+    async ignoreDocument() {
+      const doc = this.docs[this.pageNumber];
+      doc.isIgnored = !doc.isIgnored;
+      await HTTP.put(`docs/${doc.id}`, doc);
+    },
+    async submit() {
+      if (this.selectedConversationId > 0) {
+        const state = this.getState();
+        this.url = `docs?q=${this.searchQuery}&conversation=${this.selectedConversationId}&seq_annotations__isnull=${state}&offset=${this.offset}&ordering=${this.ordering}`;
+        await this.search();
+        this.pageNumber = 0;
+      }
+    },
+    parseConversationsTitle(conversation) {
+      const c = JSON.parse(conversation.metadata);
+      if (c.service !== undefined) {
+        return c.service;
+      }
+      return `Conversation ${c.id}`;
+    },
+    getCorrectedText(text) {
+      this.correctedText = text;
+    },
+    async approveDocumentCorrection() {
+      const document = this.docs[this.pageNumber];
+      if (!this.documentIsCorrected) {
+        // Edit mode
+        const correctedText = this.$refs.corrector.getText();
+        await HTTP.post(`docs/${document.id}/approve-correction`, { corrected: true, correctedText });
+        document.text = correctedText;
+      } else {
+        // Not-edit mode
+        await HTTP.post(`docs/${document.id}/approve-correction`, { corrected: false });
+      }
+      this.docs[this.pageNumber].isValidated = !this.docs[this.pageNumber].isValidated;
+    },
+  },
+  watch: {
+    async selectedConversationId() {
+      await this.submit();
+    },
+    docs() {
+      Object.keys(this.docs).forEach((k) => {
+        // If doc is validated, display humanTranscription, else humanTranscription
+        // However, if doc is not validated, but humanTranscription exists, take that one
+        const doc = this.docs[k];
+        doc.text = (this.documentIsCorrected || (!this.documentIsCorrected && doc.humanTranscription !== '')
+          ? doc.humanTranscription : doc.machineTranscription);
+      });
+    },
+    annotations() {
+      // fetch progress info.
+      HTTP.get(`statistics?include=total&include=remaining&conversation=${this.selectedConversationId}`).then((response) => {
+        this.total = response.data.total;
+        this.remaining = response.data.remaining;
+      });
+    },
+  },
+  async created() {
+    // Load conversations into drop down
+    const response = await HTTP.get('conversations');
+    this.conversations = response.data;
+    // Select first item in the list if any
+    if (this.conversations.length > 0) {
+      this.selectedConversationId = this.conversations[0].id;
+    }
+  },
+};
+</script>
diff --git a/app/server/static/components/corrector.vue b/app/server/static/components/corrector.vue
new file mode 100644
index 0000000000..c872f34f2a
--- /dev/null
+++ b/app/server/static/components/corrector.vue
@@ -0,0 +1,333 @@
+<template lang="pug">
+    div.card
+        header.card-header
+            div.card-header-title.has-background-royalblue.is-block
+              div#waveform
+                div.spin(v-if="loading")
+                  i.fa.fa-spinner.fa-pulse.fa-3x.fa-fw
+              div.controls.columns
+                div.column.is-3
+                div.column.is-1
+                  a.button(v-on:click="replay()")
+                    span.icon.tooltip(data-tooltip="Replay")
+                      i.fas.fa-redo
+                div.column.is-1
+                  a.button(v-on:click="audioPlayer.skipBackward()")
+                    span.icon.tooltip(data-tooltip="Backward")
+                      i.fas.fa-backward
+                div.column.is-1
+                  a.button(v-on:click="playSentence()")
+                    span.icon.tooltip(data-tooltip="Play/Pause")
+                      i.fas.fa-pause(v-if="isPlaying")
+                      i.fas.fa-play(v-else)
+                div.column.is-1
+                  a.button(v-on:click="audioPlayer.skipForward()")
+                    span.icon.tooltip(data-tooltip="Forward")
+                      i.fas.fa-forward
+                div.column.is-1(v-if="audioPlayer")
+                  a.button(v-on:click="audioPlayer.setMute(!audioPlayer.getMute())")
+                    span.icon.tooltip(data-tooltip="Volume")
+                      i.fas.fa-volume-off(v-if="audioPlayer.getMute()")
+                      i.fas.fa-volume-up(v-else)
+                div.column.is-4
+        header.card-header(v-if="doc.isValidated")
+            div.card-header-title.has-background-royalblue
+              div.field.is-grouped.is-grouped-multiline
+                div.control(v-for="label in labels")
+                  div.tags.has-addons
+                    a.tag.is-medium(
+                      v-shortkey.once="replaceNull(shortcutKey(label))"
+                      v-bind:style="{ \
+                        color: label.text_color, \
+                        backgroundColor: label.background_color \
+                      }"
+                      v-on:click="annotate(label.id)"
+                      v-on:shortkey="annotate(label.id)"
+                    ) {{ label.text }}
+                    span.tag.is-medium
+                      kbd {{ shortcutKey(label) | simpleShortcut }}
+        div.card-content
+          header.header(v-if="!doc.isValidated")
+            div.columns(v-if="doc.isIgnored")
+              div.column
+                div.notification.is-warning This document was
+                  strong  ignored
+                  a.button.is-success.is-pulled-right(@click="ignoreDocument")
+                    span.icon
+                      i.fas.fa-history
+                    span Restore document
+            div.columns
+              div.column
+                textarea.textarea.is-medium(
+                  type="text"
+                  v-model="correctedText"
+                  :disabled="doc.isIgnored"
+                  placeholder="Correct audio transcript here ..."
+                  autofocus
+                )
+            div.columns(v-if="!doc.isIgnored")
+              div.column
+                div.buttons.is-right
+                  a.button.is-danger(@click="revertOriginal")
+                    span.icon
+                      i.fas.fa-history
+                    span Revert to original
+                  a.button.is-warning(@click="ignoreDocument")
+                    span.icon
+                      i.fas.fa-trash-alt
+                    span Ignore
+                  a.button.is-success(@click="approveDocumentCorrection")
+                    span.icon
+                      i.fas.fa-check
+                    span Save
+
+          div(v-if="doc.isValidated")
+            div.columns
+              div.column
+                div.content(ref="textbox")
+                  annotator(
+                    v-bind:labels="labels"
+                    v-bind:entity-positions="entityPositions"
+                    v-bind:search-query="searchQuery"
+                    v-bind:text="correctedText"
+                    v-on:remove-label="removeLabel"
+                    v-on:add-label="addLabel"
+                    ref="annotator"
+                  )
+            div.columns
+              div.column
+                div.buttons.is-right
+                  a.button.is-warning(@click="approveDocumentCorrection")
+                    span.icon
+                      i.fas.fa-edit
+                    span Edit
+                  a.button.is-success(@click="approveDocumentAnnotations" v-if="!doc.annotation_approver")
+                    span.icon
+                      i.fas.fa-check
+                    span Approve annotations
+                  a.button.is-danger(@click="approveDocumentAnnotations" v-else)
+                    span.icon
+                      i.fas.fa-ban
+                    span Reject annotations
+
+</template>
+
+<style scoped>
+.p-b-md {
+  padding-bottom: 40px;
+}
+.is-block {
+  display: block;
+}
+#waveform {
+  width: 100%;
+  background: white;
+  border-radius: 40px;
+  display: block;
+  margin: 0 auto;
+  overflow: hidden;
+}
+.spin {
+  color: black;
+  margin-left: -30px;
+  width: 60px;
+  margin-top: 10px;
+  position: absolute;
+  left: 50%;
+}
+.fa.fa-spinner.fa-pulse.fa-3x.fa-fw {
+  color: black;
+}
+.controls {
+  margin-top: 5px;
+}
+</style>
+
+<script>
+import WaveSurfer from 'wavesurfer.js';
+import * as Diff from 'diff';
+import RegionPlugin from 'wavesurfer.js/dist/plugin/wavesurfer.regions';
+import Annotator from './annotator.vue';
+import annotationMixin from './annotationMixin';
+import { simpleShortcut } from './filter';
+
+export default {
+  props: ['text', 'audioFile', 'start', 'end', 'labels', 'searchQuery', 'entityPositions', 'doc'],
+  data: () => ({
+    correctedText: '',
+    audioPlayer: null,
+    isPlaying: false,
+    loading: false,
+  }),
+  filters: { simpleShortcut },
+  components: { Annotator },
+  mixins: [annotationMixin],
+  mounted() {
+    this.audioPlayer = WaveSurfer.create({
+      container: '#waveform',
+      waveColor: '#626262',
+      progressColor: 'black',
+      fillParent: false,
+      height: 80,
+      scrollParent: true,
+      minPxPerSec: 50,
+      plugins: [
+        RegionPlugin.create({
+          regions: [
+            {
+              start: this.start,
+              end: this.end,
+              drag: false,
+              resize: false,
+              loop: false,
+              color: 'hsla(225, 73%, 57%, 0.3)',
+            },
+          ],
+        }),
+      ],
+    });
+    this.loading = true;
+    this.audioPlayer.load(this.audioFile);
+    this.audioPlayer.on('ready', () => {
+      const duration = this.audioPlayer.getDuration();
+      const offset = this.start / duration;
+      this.audioPlayer.seekAndCenter(offset);
+      this.loading = false;
+    });
+
+    this.audioPlayer.on('region-click', (region, e) => {
+      e.stopPropagation();
+      if (!this.audioPlayer.isPlaying()) {
+        this.isPlaying = true;
+        region.play();
+      } else {
+        this.isPlaying = false;
+        this.audioPlayer.pause();
+      }
+    });
+
+    this.audioPlayer.on('pause', () => {
+      this.isPlaying = false;
+    });
+
+    this.audioPlayer.on('seek', () => {
+      if (this.audioPlayer.isPlaying()) {
+        this.isPlaying = true;
+      } else {
+        this.isPlaying = false;
+      }
+    });
+  },
+  methods: {
+    annotate(labelId) {
+      this.$refs.annotator.addLabel(labelId);
+    },
+    revertOriginal() {
+      this.correctedText = this.doc.machineTranscription;
+    },
+    playSentence() {
+      if (!this.audioPlayer.isPlaying()) {
+        this.isPlaying = true;
+        if (this.audioPlayer.getCurrentTime() === this.start) {
+          this.audioPlayer.play(this.start, this.end);
+        } else if (this.audioPlayer.getCurrentTime() < this.end) {
+          this.audioPlayer.play(this.audioPlayer.getCurrentTime(), this.end);
+        } else {
+          this.audioPlayer.play();
+        }
+      } else {
+        this.isPlaying = false;
+        this.audioPlayer.pause();
+      }
+    },
+    replay() {
+      this.isPlaying = true;
+      this.audioPlayer.play(this.start, this.end);
+    },
+    getText() {
+      return this.correctedText;
+    },
+    updateAnnotations() {
+      const diffs = Diff.diffChars(this.text, this.correctedText, { ignoreCase: true });
+      if (diffs.length > 1) {
+        let currentIndex = 0;
+        // eslint-disable-next-line no-restricted-syntax
+        for (const diff of diffs) {
+          if (diff.count === this.text.length) {
+            continue;
+          }
+          if (diff.added) {
+            // eslint-disable-next-line no-loop-func
+            this.entityPositions.forEach((entity) => {
+              if (entity.start_offset >= currentIndex) {
+                entity.start_offset += diff.count;
+                entity.end_offset += diff.count;
+              } else if (entity.start_offset < currentIndex && currentIndex <= entity.end_offset) {
+                entity.end_offset += diff.count;
+              }
+            });
+          } else if (diff.removed) {
+            // eslint-disable-next-line no-loop-func
+            this.entityPositions.forEach((entity) => {
+              if (entity.start_offset >= currentIndex) {
+                entity.start_offset -= diff.count;
+                entity.end_offset -= diff.count;
+              } else if (entity.start_offset < currentIndex && currentIndex <= entity.end_offset) {
+                entity.end_offset -= diff.count;
+              }
+            });
+          }
+          currentIndex += diff.count;
+
+          // Emit update event
+          this.entityPositions.forEach(el => this.$emit('update-label', el));
+        }
+      }
+    },
+    ignoreDocument() {
+      this.$emit('ignore-document');
+    },
+    approveDocumentCorrection() {
+      this.updateAnnotations();
+      this.$emit('approve-document-correction');
+    },
+    approveDocumentAnnotations() {
+      this.$emit('approve-document-annotations');
+    },
+    addLabel(label) {
+      this.$emit('add-label', label);
+    },
+
+    removeLabel(index) {
+      this.$emit('remove-label', index);
+    },
+
+  },
+  watch: {
+    start() {
+      this.audioPlayer.pause();
+      this.isPlaying = false;
+      this.audioPlayer.clearRegions();
+      this.audioPlayer.addRegion({
+        start: this.start,
+        end: this.end,
+        drag: false,
+        resize: false,
+        loop: false,
+        color: 'hsla(225, 73%, 57%, 0.3)',
+      });
+
+      const duration = this.audioPlayer.getDuration();
+      const offset = this.start / duration;
+      this.audioPlayer.seekAndCenter(offset);
+    },
+    text() {
+      this.correctedText = this.text;
+    },
+  },
+  created() {
+    this.correctedText = this.text;
+  },
+
+};
+</script>
diff --git a/app/server/static/components/download_conversations.vue b/app/server/static/components/download_conversations.vue
new file mode 100644
index 0000000000..9a4c66a6b7
--- /dev/null
+++ b/app/server/static/components/download_conversations.vue
@@ -0,0 +1,41 @@
+<template lang="pug">
+extends ./download.pug
+
+block select-format-area
+  label.radio
+    input(
+      type="radio"
+      name="format"
+      value="json"
+      v-bind:checked="format == 'json'"
+      v-model="format"
+    )
+    | JSONL
+
+  label.radio
+    input(
+      type="radio"
+      name="format"
+      value="json1"
+      v-bind:checked="format == 'json1'"
+      v-model="format"
+    )
+    | JSON(Text-Labels)
+
+block example-format-area
+  pre.code-block(v-show="format == 'json'")
+    code.json
+      include ./examples/download_sequence_labeling.jsonl
+      | ...
+
+  pre.code-block(v-show="format == 'json1'")
+    code.json
+      include ./examples/download_sequence_labeling.json1l
+      | ...
+</template>
+
+<script>
+import uploadMixin from './uploadMixin';
+
+export default uploadMixin;
+</script>
diff --git a/app/server/static/components/projects.vue b/app/server/static/components/projects.vue
index a692ce4a1d..920e1cb97b 100644
--- a/app/server/static/components/projects.vue
+++ b/app/server/static/components/projects.vue
@@ -40,6 +40,7 @@
                 option(value="DocumentClassification") document classification
                 option(value="SequenceLabeling") sequence labeling
                 option(value="Seq2seq") sequence to sequence
+                option(value="Conversations") conversations validation and labelling
             p.help.is-danger {{ projectTypeError }}
 
           div.field
@@ -200,6 +201,9 @@ export default {
       if (projectType === 'Seq2seq') {
         return this.selected === 'Seq2seq';
       }
+      if (projectType === 'Conversations') {
+        return this.selected === 'Conversations';
+      }
       return false;
     },
 
@@ -243,6 +247,9 @@ export default {
       if (this.projectType === 'Seq2seq') {
         return 'Seq2seqProject';
       }
+      if (this.projectType === 'Conversations') {
+        return 'ConversationsProject';
+      }
       return '';
     },
   },
diff --git a/app/server/static/components/upload_conversations.vue b/app/server/static/components/upload_conversations.vue
new file mode 100644
index 0000000000..7dc3b4dea9
--- /dev/null
+++ b/app/server/static/components/upload_conversations.vue
@@ -0,0 +1,46 @@
+<template lang="pug">
+extends ./upload.pug
+
+block select-format-area
+  label.radio
+    input(
+      type="radio"
+      name="format"
+      value="conll"
+      v-bind:checked="format == 'conll'"
+      v-model="format"
+    )
+    | CoNLL
+
+  label.radio
+    input(
+      type="radio"
+      name="format"
+      value="json"
+      v-bind:checked="format == 'json'"
+      v-model="format"
+    )
+    | JSONL
+
+block example-format-area
+  pre.code-block(v-show="format == 'plain'")
+    code.plaintext
+      include ./examples/upload_sequence_labeling.txt
+      | ...
+
+  pre.code-block(v-show="format == 'conll'")
+    code.plaintext
+      include ./examples/upload_sequence_labeling.conll
+      | ...
+
+  pre.code-block(v-show="format == 'json'")
+    code.json
+      include ./examples/upload_sequence_labeling.jsonl
+      | ...
+</template>
+
+<script>
+import uploadMixin from './uploadMixin';
+
+export default uploadMixin;
+</script>
diff --git a/app/server/static/package-lock.json b/app/server/static/package-lock.json
index 59e579441d..f268e20337 100644
--- a/app/server/static/package-lock.json
+++ b/app/server/static/package-lock.json
@@ -2004,6 +2004,11 @@
       "integrity": "sha512-ZIzRpLJrOj7jjP2miAtgqIfmzbxa4ZOr5jJc601zklsfEx9oTzmmj2nVpIPRpNlRTIh8lc1kyViIY7BWSGNmKw==",
       "dev": true
     },
+    "diff": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/diff/-/diff-4.0.1.tgz",
+      "integrity": "sha512-s2+XdvhPCOF01LRQBC8hf4vhbVmI2CGS5aZnxLJlT5FtdhPCDFq80q++zK2KlrVorVDdL5BOGZ/VfLrVtYNF+Q=="
+    },
     "diffie-hellman": {
       "version": "5.0.3",
       "resolved": "https://registry.npmjs.org/diffie-hellman/-/diffie-hellman-5.0.3.tgz",
@@ -8582,6 +8587,11 @@
         "neo-async": "^2.5.0"
       }
     },
+    "wavesurfer.js": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/wavesurfer.js/-/wavesurfer.js-3.2.0.tgz",
+      "integrity": "sha512-P75SSpYTpzpCKFKjxmHkdp2jGpcm4neaGncBGV/jzfI5FPSIfl5mXTTZlZFpJhs7To+NI34Dj5y661JI43HEzA=="
+    },
     "wbuf": {
       "version": "1.7.3",
       "resolved": "https://registry.npmjs.org/wbuf/-/wbuf-1.7.3.tgz",
diff --git a/app/server/static/package.json b/app/server/static/package.json
index d54be622af..7c0e0fb3c1 100644
--- a/app/server/static/package.json
+++ b/app/server/static/package.json
@@ -18,6 +18,7 @@
     "axios-mock-adapter": "^1.17.0",
     "buefy": "^0.8.2",
     "chart.js": "^2.7.2",
+    "diff": "^4.0.1",
     "highlight.js": "^9.12.0",
     "lodash.isempty": "^4.4.0",
     "marked": "^0.7.0",
@@ -28,7 +29,8 @@
     "vue-json-pretty": "^1.6.0",
     "vue-loader": "^15.2.4",
     "vue-shortkey": "^3.1.6",
-    "vue-swatches": "^1.0.3"
+    "vue-swatches": "^1.0.3",
+    "wavesurfer.js": "^3.2.0"
   },
   "devDependencies": {
     "babel-eslint": "^10.0.1",
diff --git a/app/server/static/pages/conversations.js b/app/server/static/pages/conversations.js
new file mode 100644
index 0000000000..a017aba9d6
--- /dev/null
+++ b/app/server/static/pages/conversations.js
@@ -0,0 +1,14 @@
+import Vue from 'vue';
+import Conversations from '../components/conversations.vue';
+
+Vue.use(require('vue-shortkey'), {
+  prevent: ['input', 'textarea'],
+});
+
+new Vue({
+  el: '#mail-app',
+
+  components: { Conversations },
+
+  template: '<Conversations />',
+});
diff --git a/app/server/static/pages/download_conversations.js b/app/server/static/pages/download_conversations.js
new file mode 100644
index 0000000000..20acc48431
--- /dev/null
+++ b/app/server/static/pages/download_conversations.js
@@ -0,0 +1,10 @@
+import Vue from 'vue';
+import DownloadConversations from '../components/download_conversations.vue';
+
+new Vue({
+  el: '#mail-app',
+
+  components: { DownloadConversations },
+
+  template: '<DownloadConversations />',
+});
diff --git a/app/server/static/pages/upload_conversations.js b/app/server/static/pages/upload_conversations.js
new file mode 100644
index 0000000000..7a10543c49
--- /dev/null
+++ b/app/server/static/pages/upload_conversations.js
@@ -0,0 +1,10 @@
+import Vue from 'vue';
+import UploadConversations from '../components/upload_conversations.vue';
+
+new Vue({
+  el: '#mail-app',
+
+  components: { UploadConversations },
+
+  template: '<UploadConversations />',
+});
diff --git a/app/server/templates/base.html b/app/server/templates/base.html
index 12925c693b..9aabfa4267 100644
--- a/app/server/templates/base.html
+++ b/app/server/templates/base.html
@@ -9,7 +9,7 @@
   <meta name="viewport" content="width=device-width, initial-scale=1">
   <title>doccano - Document Annotation Tool</title>
 
-  <link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.0.13/css/all.css" integrity="sha384-DNOHZ68U8hZfKXOrtjWvjxusGo9WQnrNx2sqG0tfsghAvtVlRW3tvkXWZh58N9jp"
+  <link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.12.0/css/all.css"
     crossorigin="anonymous">
   <link href="https://fonts.googleapis.com/css?family=Open+Sans:300,400,700" rel="stylesheet">
   <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bulma/0.7.1/css/bulma.min.css" crossorigin="anonymous">
diff --git a/docker-compose.yml b/docker-compose.yml
index 9b41948997..0d2d93449f 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -12,7 +12,10 @@ services:
       ADMIN_PASSWORD: "password"
       ADMIN_EMAIL: "admin@example.com"
       DATABASE_URL: "postgres://doccano:doccano@postgres:5432/doccano?sslmode=disable"
-      ALLOW_SIGNUP: "False" 
+      ALLOW_SIGNUP: "False"
+      DOCCANO_PAGE_SIZE: 50
+    env_file:
+      - local.env
     ports:
       - 8000:8000
 
@@ -31,6 +34,8 @@ services:
 
   postgres:
     image: postgres:9.6
+    volumes:
+      - postgres_data:/var/lib/postgresql/data/
     environment:
       POSTGRES_USER: "doccano"
       POSTGRES_PASSWORD: "doccano"
@@ -41,3 +46,4 @@ services:
 volumes:
   node_modules:
   venv:
+  postgres_data:
\ No newline at end of file
diff --git a/requirements.txt b/requirements.txt
index 12b9fe1342..c661f4bd14 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -14,6 +14,7 @@ django-polymorphic==2.0.3
 django-pyodbc-azure==2.1.0.0
 django-rest-polymorphic==0.1.8
 djangorestframework==3.10
+django-storages[azure]==1.8
 djangorestframework-csv==2.1.0
 djangorestframework-filters==0.10.2
 environs==4.1.0