diff --git a/models/Answer.js b/models/Answer.js
index 62ffc94..a2d1d5c 100644
--- a/models/Answer.js
+++ b/models/Answer.js
@@ -69,7 +69,8 @@ module.exports = (sequelize, DataTypes) =>
   Answer.associate = function(models)
   {
       Answer.belongsTo(models.User, { foreignKey: { name: "UserId", allowNull: false }, onDelete: 'CASCADE', onUpdate: 'CASCADE' });
-      Answer.belongsTo(models.Questionnaire, { foreignKey: { name: "QuestionnaireId", allowNull: false }, onDelete: 'CASCADE', onUpdate: 'CASCADE' });
+      Answer.belongsTo(models.Questionnaire, { foreignKey: { name: "QuestionnaireId", allowNull: true }, onDelete: 'CASCADE', onUpdate: 'CASCADE' });
+      Answer.belongsTo(models.Group, { foreignKey: { name: "GroupId", allowNull: true }, onDelete: 'CASCADE', onUpdate: 'CASCADE' });
   };
   return Answer;
 };
\ No newline at end of file
diff --git a/models/Group.js b/models/Group.js
index 3106f18..6b57ef8 100644
--- a/models/Group.js
+++ b/models/Group.js
@@ -88,6 +88,7 @@ module.exports = (sequelize, DataTypes) =>
     Group.associate = function(models)
     {
         Group.hasMany(models.Questionnaire);
+        Group.hasMany(models.Answer);        
         Group.belongsTo(models.User, { as: "Creator", foreignKey: { name: "CreatorId", allowNull: false } });
     };
     return Group;
diff --git a/models/wikilerni-crea.sql b/models/wikilerni-crea.sql
index 302c448..95fb510 100644
--- a/models/wikilerni-crea.sql
+++ b/models/wikilerni-crea.sql
@@ -3,7 +3,7 @@
 -- https://www.phpmyadmin.net/
 --
 -- Client :  localhost:3306
--- Généré le :  Mer 21 Octobre 2020 à 17:36
+-- Généré le :  Mer 21 Octobre 2020 à 17:55
 -- Version du serveur :  5.7.31-0ubuntu0.18.04.1
 -- Version de PHP :  7.2.24-0ubuntu0.18.04.7
 
@@ -33,7 +33,8 @@ CREATE TABLE `Answers` (
   `duration` int(5) UNSIGNED DEFAULT NULL,
   `createdAt` datetime NOT NULL,
   `UserId` int(11) NOT NULL,
-  `QuestionnaireId` int(11) NOT NULL
+  `QuestionnaireId` int(11) DEFAULT NULL,
+  `GroupId` int(11) DEFAULT NULL
 ) ENGINE=InnoDB DEFAULT CHARSET=latin1;
 
 -- --------------------------------------------------------
@@ -273,7 +274,8 @@ CREATE TABLE `Users` (
 ALTER TABLE `Answers`
   ADD PRIMARY KEY (`id`),
   ADD KEY `UserId` (`UserId`),
-  ADD KEY `QuestionnaireId` (`QuestionnaireId`);
+  ADD KEY `QuestionnaireId` (`QuestionnaireId`),
+  ADD KEY `GroupId` (`GroupId`);
 
 --
 -- Index pour la table `Choices`
@@ -442,7 +444,7 @@ ALTER TABLE `Tags`
 -- AUTO_INCREMENT pour la table `UserDeleteds`
 --
 ALTER TABLE `UserDeleteds`
-  MODIFY `id` int(11) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=6;
+  MODIFY `id` int(11) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=7;
 --
 -- AUTO_INCREMENT pour la table `Users`
 --
@@ -457,7 +459,8 @@ ALTER TABLE `Users`
 --
 ALTER TABLE `Answers`
   ADD CONSTRAINT `Answers_ibfk_7` FOREIGN KEY (`UserId`) REFERENCES `Users` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,
-  ADD CONSTRAINT `Answers_ibfk_8` FOREIGN KEY (`QuestionnaireId`) REFERENCES `Questionnaires` (`id`) ON DELETE CASCADE ON UPDATE CASCADE;
+  ADD CONSTRAINT `Answers_ibfk_8` FOREIGN KEY (`QuestionnaireId`) REFERENCES `Questionnaires` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,
+  ADD CONSTRAINT `Answers_ibfk_9` FOREIGN KEY (`GroupId`) REFERENCES `Groups` (`id`) ON DELETE CASCADE ON UPDATE CASCADE;
 
 --
 -- Contraintes pour la table `Choices`