diff --git a/persistence/src/main/java/fr/gasser/daoexample/dao/Dao.java b/persistence/src/main/java/fr/gasser/daoexample/dao/Dao.java
index fe3b9fe..44e746b 100644
--- a/persistence/src/main/java/fr/gasser/daoexample/dao/Dao.java
+++ b/persistence/src/main/java/fr/gasser/daoexample/dao/Dao.java
@@ -17,7 +17,7 @@ public abstract class Dao<T extends Entity> {
 
     public abstract T find(int id);
 
-    public abstract List<T> findAll(T obj);
+    public abstract List<T> findAll();
 
     public abstract boolean update(T obj);
 
diff --git a/persistence/src/main/java/fr/gasser/daoexample/dao/DaoAbstractFactory.java b/persistence/src/main/java/fr/gasser/daoexample/dao/DaoAbstractFactory.java
index ad5b04b..0eab54b 100644
--- a/persistence/src/main/java/fr/gasser/daoexample/dao/DaoAbstractFactory.java
+++ b/persistence/src/main/java/fr/gasser/daoexample/dao/DaoAbstractFactory.java
@@ -1,5 +1,9 @@
 package fr.gasser.daoexample.dao;
 
+import fr.gasser.daoexample.model.Discipline;
+import fr.gasser.daoexample.model.Student;
+import fr.gasser.daoexample.model.Teacher;
+
 public interface DaoAbstractFactory {
 
     static DaoAbstractFactory createFactory(FactoryType type) {
@@ -18,10 +22,10 @@ public interface DaoAbstractFactory {
         return createFactory(FactoryType.DaoFactory);
     }
 
-    StudentDao createStudentDao();
+    Dao<Student> createStudentDao();
 
-    TeacherDao createTeacherDao();
+    Dao<Teacher> createTeacherDao();
 
-    DisciplineDao createDisciplineDao();
+    Dao<Discipline> createDisciplineDao();
 
 }
diff --git a/persistence/src/main/java/fr/gasser/daoexample/dao/DaoFactory.java b/persistence/src/main/java/fr/gasser/daoexample/dao/DaoFactory.java
index 606f263..77bc207 100644
--- a/persistence/src/main/java/fr/gasser/daoexample/dao/DaoFactory.java
+++ b/persistence/src/main/java/fr/gasser/daoexample/dao/DaoFactory.java
@@ -1,5 +1,8 @@
 package fr.gasser.daoexample.dao;
 
+import fr.gasser.daoexample.model.Discipline;
+import fr.gasser.daoexample.model.Student;
+import fr.gasser.daoexample.model.Teacher;
 import fr.gasser.daoexample.sql.Connection;
 import fr.gasser.daoexample.sql.DummyConnection;
 
@@ -7,17 +10,17 @@ public class DaoFactory implements DaoAbstractFactory {
     private static Connection connection = new DummyConnection();
 
     @Override
-    public StudentDao createStudentDao() {
+    public Dao<Student> createStudentDao() {
         return new StudentDao(DaoFactory.connection);
     }
 
     @Override
-    public TeacherDao createTeacherDao() {
+    public Dao<Teacher> createTeacherDao() {
         return new TeacherDao(DaoFactory.connection);
     }
 
     @Override
-    public DisciplineDao createDisciplineDao() {
+    public Dao<Discipline> createDisciplineDao() {
         return new DisciplineDao(DaoFactory.connection);
     }
 }
diff --git a/persistence/src/main/java/fr/gasser/daoexample/dao/DisciplineDao.java b/persistence/src/main/java/fr/gasser/daoexample/dao/DisciplineDao.java
index 61ac979..9f7fb25 100644
--- a/persistence/src/main/java/fr/gasser/daoexample/dao/DisciplineDao.java
+++ b/persistence/src/main/java/fr/gasser/daoexample/dao/DisciplineDao.java
@@ -31,7 +31,7 @@ public class DisciplineDao extends Dao<Discipline> {
     }
 
     @Override
-    public List<Discipline> findAll(Discipline obj) {
+    public List<Discipline> findAll() {
         return DISCIPLINES;
     }
 
diff --git a/persistence/src/main/java/fr/gasser/daoexample/dao/StudentDao.java b/persistence/src/main/java/fr/gasser/daoexample/dao/StudentDao.java
index 34b0c5c..50fad64 100644
--- a/persistence/src/main/java/fr/gasser/daoexample/dao/StudentDao.java
+++ b/persistence/src/main/java/fr/gasser/daoexample/dao/StudentDao.java
@@ -32,7 +32,7 @@ public class StudentDao extends Dao<Student> {
     }
 
     @Override
-    public List<Student> findAll(Student obj) {
+    public List<Student> findAll() {
         return students;
     }
 
diff --git a/persistence/src/main/java/fr/gasser/daoexample/dao/TeacherDao.java b/persistence/src/main/java/fr/gasser/daoexample/dao/TeacherDao.java
index 8becfa0..6e0d864 100644
--- a/persistence/src/main/java/fr/gasser/daoexample/dao/TeacherDao.java
+++ b/persistence/src/main/java/fr/gasser/daoexample/dao/TeacherDao.java
@@ -31,7 +31,7 @@ public class TeacherDao extends Dao<Teacher> {
     }
 
     @Override
-    public List<Teacher> findAll(Teacher obj) {
+    public List<Teacher> findAll() {
         return teachers;
     }
 
diff --git a/persistence/src/main/java/fr/gasser/daoexample/model/Student.java b/persistence/src/main/java/fr/gasser/daoexample/model/Student.java
index 3d2472e..98ffbd1 100644
--- a/persistence/src/main/java/fr/gasser/daoexample/model/Student.java
+++ b/persistence/src/main/java/fr/gasser/daoexample/model/Student.java
@@ -2,37 +2,45 @@ package fr.gasser.daoexample.model;
 
 public class Student extends Entity {
 
-    private String nom;
-    private String prenom;
+    private String name;
+    private String surname;
 
     public Student() {
         this(0, "", "");
     }
 
-    public Student(int id, String nom, String prenom) {
+    public Student(int id, String name, String surname) {
         super(id);
-        this.nom = nom;
-        this.prenom = prenom;
+        this.name = name;
+        this.surname = surname;
     }
 
 
     public String getName() {
-        return nom;
+        return name;
     }
 
 
-    public void setNom(String nom) {
-        this.nom = nom;
+    public void setName(String name) {
+        this.name = name;
     }
 
 
     public String getSurname() {
-        return prenom;
+        return surname;
     }
 
 
-    public void setPrenom(String prenom) {
-        this.prenom = prenom;
+    public void setSurname(String surname) {
+        this.surname = surname;
     }
 
+    @Override
+    public String toString() {
+        return "Student{" +
+                "name='" + name + '\'' +
+                ", surname='" + surname + '\'' +
+                ", id=" + id +
+                '}';
+    }
 }
\ No newline at end of file
diff --git a/persistence/src/main/java/fr/gasser/daoexample/sql/Connection.java b/persistence/src/main/java/fr/gasser/daoexample/sql/Connection.java
index 36ac760..c610453 100644
--- a/persistence/src/main/java/fr/gasser/daoexample/sql/Connection.java
+++ b/persistence/src/main/java/fr/gasser/daoexample/sql/Connection.java
@@ -1,9 +1,11 @@
 package fr.gasser.daoexample.sql;
 
-public interface Connection {
-    void connect();
+import java.sql.SQLException;
 
-    void close();
+public interface Connection {
+    void connect() throws SQLException;
+
+    void close() throws SQLException;
 
     java.sql.Connection getConnection();
 }