diff --git a/.github/workflows/pull-request.yaml b/.github/workflows/pull-request.yaml
index 9375fcb..4466172 100644
--- a/.github/workflows/pull-request.yaml
+++ b/.github/workflows/pull-request.yaml
@@ -9,3 +9,5 @@ jobs:
       - uses: actions/checkout@v4
       - uses: bufbuild/buf-setup-action@v1
       - uses: bufbuild/buf-lint-action@v1
+        with:
+          input: proto
diff --git a/buf.yaml b/proto/buf.yaml
similarity index 72%
rename from buf.yaml
rename to proto/buf.yaml
index 84d9c3b..3246458 100644
--- a/buf.yaml
+++ b/proto/buf.yaml
@@ -4,3 +4,4 @@ lint:
     - DEFAULT
   except:
     - PACKAGE_VERSION_SUFFIX
+    - PACKAGE_DIRECTORY_MATCH
diff --git a/proto/error.proto b/proto/error.proto
new file mode 100644
index 0000000..ce89b05
--- /dev/null
+++ b/proto/error.proto
@@ -0,0 +1,8 @@
+syntax = "proto3";
+
+package proto;
+
+message ErrorDTO {
+    int32 code = 1;
+    string message = 2;
+}
diff --git a/proto/feedback.proto b/proto/feedback.proto
new file mode 100644
index 0000000..2a55802
--- /dev/null
+++ b/proto/feedback.proto
@@ -0,0 +1,35 @@
+syntax = "proto3";
+
+package proto;
+
+message PronunciationFeedbackDTO {
+    string sentence_id = 1;
+    repeated int32 incorrect_indexes = 2;
+    int32 pronunciation_score = 3;
+    int32 volume_score = 4;
+    int32 speed_score = 5;
+    string overall_feedback = 6;
+}
+
+message GetPronunciationFeedbackRequest {
+    string sentence_id = 1;
+    string audio_file_url = 2;
+}
+
+message GetPronunciationFeedbackResponse {
+    PronunciationFeedbackDTO pronunciation_feeback = 1;
+}
+
+message CommunicationFeedbackDTO {
+    string scene_id = 1;
+    string overall_feedback = 2;
+}
+
+message GetCommunicationFeedbackRequest {
+    string scene_id = 1;
+    string audio_file_url = 2;
+}
+
+message GetCommunicationFeedbackResponse {
+    CommunicationFeedbackDTO communication_feedback = 1;
+}
diff --git a/proto/history.proto b/proto/history.proto
new file mode 100644
index 0000000..fef4399
--- /dev/null
+++ b/proto/history.proto
@@ -0,0 +1,27 @@
+syntax = "proto3";
+
+package proto;
+
+import "feedback.proto";
+
+enum HistoryType {
+    HISTORY_TYPE_UNSPECIFIED = 0;
+    HISTORY_TYPE_PRONUNCIATION = 1;
+    HISTORY_TYPE_COMMUNICATION = 2;
+}
+
+message FeebackHistoryDTO {
+    HistoryType type = 1;
+    oneof feeback {
+        PronunciationFeedbackDTO pronunciation = 2;
+        CommunicationFeedbackDTO communication = 3;
+    }
+}
+
+message ListHistoriesRequest {
+    optional HistoryType type = 1;
+}
+
+message ListHistoriesResponse {
+    repeated FeebackHistoryDTO histories = 1;
+}
diff --git a/proto/scene.proto b/proto/scene.proto
new file mode 100644
index 0000000..9925ce1
--- /dev/null
+++ b/proto/scene.proto
@@ -0,0 +1,18 @@
+syntax = "proto3";
+
+package proto;
+
+// information for sentence formation practice
+message SceneDTO {
+    string id = 1;
+    string image_url = 2;
+    string question = 3;
+}
+
+message GetSceneRequest {
+    string id = 1;
+}
+
+message GetSceneResponse {
+    SceneDTO scene = 1;
+}
diff --git a/proto/sentence.proto b/proto/sentence.proto
new file mode 100644
index 0000000..e18811d
--- /dev/null
+++ b/proto/sentence.proto
@@ -0,0 +1,17 @@
+syntax = "proto3";
+
+package proto;
+
+// sentence which user has to try to pronounce
+message SentenceDTO {
+    string id = 1;
+    string text = 2;
+}
+
+message GetSetenceRequest {
+    string id = 1;
+}
+
+message GetSetenceResponse {
+    SentenceDTO sentence = 1;
+}
diff --git a/proto/topic.proto b/proto/topic.proto
new file mode 100644
index 0000000..cc029ae
--- /dev/null
+++ b/proto/topic.proto
@@ -0,0 +1,34 @@
+syntax = "proto3";
+
+package proto;
+
+// topic used to select the theme of the session
+message TopicDTO {
+    string id = 1;
+    string title = 2;
+    string thumbnail_url = 3;
+    repeated string sentence_ids = 4;
+    repeated string scene_ids = 5;
+}
+
+message CompactTopicDTO {
+    string id = 1;
+    string title = 2;
+    string thumbnail_url = 3;
+}
+
+message ListTopicsRequest {
+    // empty
+}
+
+message ListTopicsResponse {
+    repeated CompactTopicDTO topics = 1;
+}
+
+message GetTopicRequest {
+    string id = 1;
+}
+
+message GetTopicResponse {
+    TopicDTO topic = 1;
+}
diff --git a/proto/user.proto b/proto/user.proto
index 0bf0ce5..a5ef48f 100644
--- a/proto/user.proto
+++ b/proto/user.proto
@@ -6,11 +6,6 @@ message UserDTO {
     string id = 1;
     string name = 2; 
     int32 age = 3;
-    DisorderType disorder_type = 4;
-}
-
-enum DisorderType {
-    DISORDER_TYPE_UNSPECIFIED = 0;
 }
 
 message GetUserRequest {
@@ -25,7 +20,6 @@ message UpdateUserRequest {
     string id = 1;
     optional string name = 2; 
     optional int32 age = 3;
-    DisorderType disorder_type = 4;
 }
 
 message UpdateUserResponse {