diff --git a/persistence/pom.xml b/persistence/pom.xml
index 1893e05..bf6bb73 100644
--- a/persistence/pom.xml
+++ b/persistence/pom.xml
@@ -10,7 +10,7 @@
         <version>1.0-SNAPSHOT</version>
     </parent>
 
-    <artifactId>patterns</artifactId>
+    <artifactId>persitence</artifactId>
     <version>1.0-SNAPSHOT</version>
 
     <dependencies>
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 9763ff3..709e8e8 100644
--- a/persistence/src/main/java/fr/gasser/daoexample/dao/Dao.java
+++ b/persistence/src/main/java/fr/gasser/daoexample/dao/Dao.java
@@ -4,15 +4,15 @@ import fr.gasser.daoexample.model.Entity;
 
 import java.util.List;
 
-public abstract class Dao<T extends Entity> {
+public interface Dao<T extends Entity> {
 
-    public abstract boolean create(T obj);
+    boolean create(T obj);
 
-    public abstract T find(int id);
+    T find(int id);
 
-    public abstract List<T> findAll();
+    List<T> findAll();
 
-    public abstract boolean update(T obj);
+    boolean update(T obj);
 
-    public abstract boolean delete(T obj);
+    boolean delete(T obj);
 }
diff --git a/persistence/src/main/java/fr/gasser/daoexample/dao/dummy/DisciplineDao.java b/persistence/src/main/java/fr/gasser/daoexample/dao/dummy/DisciplineDao.java
index 13846ce..5021a66 100644
--- a/persistence/src/main/java/fr/gasser/daoexample/dao/dummy/DisciplineDao.java
+++ b/persistence/src/main/java/fr/gasser/daoexample/dao/dummy/DisciplineDao.java
@@ -7,7 +7,7 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 
-public class DisciplineDao extends Dao<Discipline> {
+public class DisciplineDao implements Dao<Discipline> {
 
     // Emulate discipline table
     private final static List<Discipline> DISCIPLINES = new ArrayList<>(Arrays.asList(
diff --git a/persistence/src/main/java/fr/gasser/daoexample/dao/dummy/StudentDao.java b/persistence/src/main/java/fr/gasser/daoexample/dao/dummy/StudentDao.java
index c0a6601..2228279 100644
--- a/persistence/src/main/java/fr/gasser/daoexample/dao/dummy/StudentDao.java
+++ b/persistence/src/main/java/fr/gasser/daoexample/dao/dummy/StudentDao.java
@@ -7,7 +7,7 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 
-public class StudentDao extends Dao<Student> {
+public class StudentDao implements Dao<Student> {
 
     // Emulate student table
     private final static List<Student> students = new ArrayList<>(Arrays.asList(
diff --git a/persistence/src/main/java/fr/gasser/daoexample/dao/dummy/TeacherDao.java b/persistence/src/main/java/fr/gasser/daoexample/dao/dummy/TeacherDao.java
index a4796c1..708dc8c 100644
--- a/persistence/src/main/java/fr/gasser/daoexample/dao/dummy/TeacherDao.java
+++ b/persistence/src/main/java/fr/gasser/daoexample/dao/dummy/TeacherDao.java
@@ -7,7 +7,7 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 
-public class TeacherDao extends Dao<Teacher> {
+public class TeacherDao implements Dao<Teacher> {
 
     // Emulate teacher table
     private final static List<Teacher> teachers = new ArrayList<>(Arrays.asList(
diff --git a/persistence/src/main/java/fr/gasser/daoexample/dao/sqlite/StudentSQLiteDao.java b/persistence/src/main/java/fr/gasser/daoexample/dao/sqlite/StudentSQLiteDao.java
index 077b957..ef42787 100644
--- a/persistence/src/main/java/fr/gasser/daoexample/dao/sqlite/StudentSQLiteDao.java
+++ b/persistence/src/main/java/fr/gasser/daoexample/dao/sqlite/StudentSQLiteDao.java
@@ -15,7 +15,7 @@ import java.sql.Statement;
 import java.util.ArrayList;
 import java.util.List;
 
-public class StudentSQLiteDao extends Dao<Student> {
+public class StudentSQLiteDao implements Dao<Student> {
 
     private static final Logger LOGGER = LoggerFactory.getLogger(StudentSQLiteDao.class);
     private final ConnectionWrapper wrapper;