diff --git a/composer.json b/composer.json
index de4e92f..33be175 100644
--- a/composer.json
+++ b/composer.json
@@ -1,6 +1,6 @@
 {
   "name": "codeinc/collection-interface",
-  "version": "1.0.0",
+  "version": "1.1.0",
   "description": "A simple PHP interface for iterable collections",
   "homepage": "https://github.com/CodeIncHQ/CollectionInterface",
   "type": "library",
diff --git a/src/AggregatedCollectionInterface.php b/src/AggregatedCollectionInterface.php
new file mode 100644
index 0000000..c632b9a
--- /dev/null
+++ b/src/AggregatedCollectionInterface.php
@@ -0,0 +1,33 @@
+<?php
+//
+// +---------------------------------------------------------------------+
+// | CODE INC. SOURCE CODE                                               |
+// +---------------------------------------------------------------------+
+// | Copyright (c) 2018 - Code Inc. SAS - All Rights Reserved.           |
+// | Visit https://www.codeinc.fr for more information about licensing.  |
+// +---------------------------------------------------------------------+
+// | NOTICE:  All information contained herein is, and remains the       |
+// | property of Code Inc. SAS. The intellectual and technical concepts  |
+// | contained herein are proprietary to Code Inc. SAS are protected by  |
+// | trade secret or copyright law. Dissemination of this information or |
+// | reproduction of this material is strictly forbidden unless prior    |
+// | written permission is obtained from Code Inc. SAS.                  |
+// +---------------------------------------------------------------------+
+//
+// Author:   Joan Fabrégat <joan@codeinc.fr>
+// Date:     24/09/2018
+// Project:  CollectionInterface
+//
+declare(strict_types=1);
+namespace CodeInc\CollectionInterface;
+
+/**
+ * Interface AggregatedCollectionInterface
+ *
+ * @package CodeInc\CollectionInterface
+ * @author Joan Fabrégat <joan@codeinc.fr>
+ */
+interface AggregatedCollectionInterface extends CollectionInterface, \IteratorAggregate
+{
+
+}
\ No newline at end of file
diff --git a/src/CollectionInterface.php b/src/CollectionInterface.php
index 74f36c4..c68dfe5 100644
--- a/src/CollectionInterface.php
+++ b/src/CollectionInterface.php
@@ -26,29 +26,8 @@
  *
  * @package CodeInc\CollectionInterface
  * @author Joan Fabrégat <joan@codeinc.fr>
- * @version 1.0
  */
-interface CollectionInterface extends \Iterator, \Countable
+interface CollectionInterface extends \Traversable
 {
-    /**
-     * @inheritdoc
-     */
-    public function rewind():void;
 
-    /**
-     * @inheritdoc
-     */
-    public function next():void;
-
-    /**
-     * @inheritdoc
-     * @return bool
-     */
-    public function valid():bool;
-
-    /**
-     * @inheritdoc
-     * @return int
-     */
-    public function count():int;
 }
\ No newline at end of file
diff --git a/src/CountableCollectionInterface.php b/src/CountableCollectionInterface.php
new file mode 100644
index 0000000..6035687
--- /dev/null
+++ b/src/CountableCollectionInterface.php
@@ -0,0 +1,37 @@
+<?php
+//
+// +---------------------------------------------------------------------+
+// | CODE INC. SOURCE CODE                                               |
+// +---------------------------------------------------------------------+
+// | Copyright (c) 2018 - Code Inc. SAS - All Rights Reserved.           |
+// | Visit https://www.codeinc.fr for more information about licensing.  |
+// +---------------------------------------------------------------------+
+// | NOTICE:  All information contained herein is, and remains the       |
+// | property of Code Inc. SAS. The intellectual and technical concepts  |
+// | contained herein are proprietary to Code Inc. SAS are protected by  |
+// | trade secret or copyright law. Dissemination of this information or |
+// | reproduction of this material is strictly forbidden unless prior    |
+// | written permission is obtained from Code Inc. SAS.                  |
+// +---------------------------------------------------------------------+
+//
+// Author:   Joan Fabrégat <joan@codeinc.fr>
+// Date:     24/09/2018
+// Project:  CollectionInterface
+//
+declare(strict_types=1);
+namespace CodeInc\CollectionInterface;
+
+/**
+ * Interface CountableCollectionInterface
+ *
+ * @package CodeInc\CollectionInterface
+ * @author Joan Fabrégat <joan@codeinc.fr>
+ */
+interface CountableCollectionInterface extends CollectionInterface, \Countable
+{
+    /**
+     * @inheritdoc
+     * @return int
+     */
+    public function count():int;
+}
\ No newline at end of file
diff --git a/src/IteratorCollectionInterface.php b/src/IteratorCollectionInterface.php
new file mode 100644
index 0000000..3aa95b7
--- /dev/null
+++ b/src/IteratorCollectionInterface.php
@@ -0,0 +1,47 @@
+<?php
+//
+// +---------------------------------------------------------------------+
+// | CODE INC. SOURCE CODE                                               |
+// +---------------------------------------------------------------------+
+// | Copyright (c) 2018 - Code Inc. SAS - All Rights Reserved.           |
+// | Visit https://www.codeinc.fr for more information about licensing.  |
+// +---------------------------------------------------------------------+
+// | NOTICE:  All information contained herein is, and remains the       |
+// | property of Code Inc. SAS. The intellectual and technical concepts  |
+// | contained herein are proprietary to Code Inc. SAS are protected by  |
+// | trade secret or copyright law. Dissemination of this information or |
+// | reproduction of this material is strictly forbidden unless prior    |
+// | written permission is obtained from Code Inc. SAS.                  |
+// +---------------------------------------------------------------------+
+//
+// Author:   Joan Fabrégat <joan@codeinc.fr>
+// Date:     24/09/2018
+// Project:  CollectionInterface
+//
+declare(strict_types=1);
+namespace CodeInc\CollectionInterface;
+
+/**
+ * Interface IteratorCollectionInterface
+ *
+ * @package CodeInc\CollectionInterface
+ * @author Joan Fabrégat <joan@codeinc.fr>
+ */
+interface IteratorCollectionInterface extends CollectionInterface, \Iterator
+{
+    /**
+     * @inheritdoc
+     */
+    public function rewind():void;
+
+    /**
+     * @inheritdoc
+     */
+    public function next():void;
+
+    /**
+     * @inheritdoc
+     * @return bool
+     */
+    public function valid():bool;
+}
\ No newline at end of file