diff --git a/Source/API/script/Gateway/GatewayQuestion.php b/Source/API/script/Gateway/GatewayQuestion.php
index ebf57fb..f8ed3b8 100644
--- a/Source/API/script/Gateway/GatewayQuestion.php
+++ b/Source/API/script/Gateway/GatewayQuestion.php
@@ -59,7 +59,40 @@ class GatewayQuestion
         }
     }
 
-    public function updateQuestion(Question $question){
+    public function deleteQuestion(Question $question)
+    {
+        if(get_class($question) == BoxQuestion::class) {
+            $query = "DELETE FROM Propose WHERE question = :id";
+            $this->connection->executeQuery($query, array(
+                ':id' => array($question->getId(), PDO::PARAM_INT)
+            ));
+            $this->connection->executeQuery();
+
+            $listPossibleResponse = $question->getPossibleResponses();
+            for ($i = 0; $i < count($listPossibleResponse); $i++){
+                $query = "DELETE FROM Reference WHERE response = :id";
+                $this->connection->executeQuery($query, array(
+                    ':id' => array($listPossibleResponse[$i]->getId(), PDO::PARAM_INT)
+                ));
+                $this->connection->executeQuery();
+
+                $query = "DELETE FROM PossibleResponse WHERE id = :id";
+                $this->connection->executeQuery($query, array(
+                    ':id' => array($listPossibleResponse[$i]->getId(), PDO::PARAM_INT)
+                ));
+                $this->connection->executeQuery();
+            }
+        }
+
+        $query = "DELETE FROM Question WHERE id = :id";
+        $this->connection->executeQuery($query, array(
+            ':id' => array($question->getId(), PDO::PARAM_INT)
+        ));
+        $this->connection->executeQuery();
+    }
+
+    public function updateQuestion(Question $question)
+    {
         $query = "UPDATE Question SET  content = :content, type = :type, form = :form WHERE id = :id";
         $this->connection->executeQuery($query, array(
             ':content' => array($question->getContent(), PDO::PARAM_STR),