diff --git a/YACOSCore/ejbModule/org/yacos/core/conferences/ConferenceManagerBean.java b/YACOSCore/ejbModule/org/yacos/core/conferences/ConferenceManagerBean.java
index aeef941..c907e90 100644
--- a/YACOSCore/ejbModule/org/yacos/core/conferences/ConferenceManagerBean.java
+++ b/YACOSCore/ejbModule/org/yacos/core/conferences/ConferenceManagerBean.java
@@ -11,7 +11,6 @@ import javax.persistence.Query;
 
 import org.yacos.core.users.Role;
 import org.yacos.core.users.User;
-import org.yacos.core.users.UserManagerBean;
 
 
 @Stateless
@@ -45,14 +44,13 @@ public class ConferenceManagerBean implements IConferenceManager {
 	
 	public List<Conference> getConferences(User user){
 		List<Conference> list = new ArrayList<Conference>();
-		List<Role> tmpList = new UserManagerBean().getRoles();
 		
+		List<Role> tmpList = this.getRoles(user);
+
 		Conference conf;
 		for (Role role : tmpList) {
 			conf = role.getConference();
-			if(!list.contains(conf)){
-				list.add(conf);
-			}
+			list.add(conf);
 		}
 		return list;
 	}
@@ -60,12 +58,11 @@ public class ConferenceManagerBean implements IConferenceManager {
 	
 	/* 
 	 * 
-	 * méthodes relatives aux roles
+	 * méthodes relatives aux roles
 	 * */
 	
 	public void addRole(Role.RoleType roleType, User user, Conference conf) {
 		Role role = new Role(roleType, user, conf);
-		System.out.println(role);
 		em.persist(role);
 	}
 
@@ -77,21 +74,30 @@ public class ConferenceManagerBean implements IConferenceManager {
 		em.merge(role);
 	}
 	
-	//FIXME
-	//methode utile?
-	public List<Role> getRoles(){
-		return em.createQuery("from Role role").getResultList();
-		
+	@SuppressWarnings("unchecked")
+	public List<Role> getRoles(Conference conf){
+		Query query = em.createQuery("from Role role where conference = ?");
+		query.setParameter(1, conf);		 		
+		return query.getResultList();
 	}
 	
+	@SuppressWarnings("unchecked")	
+	public List<Role> getRoles(User user) {
+		 Query query = em.createQuery("from Role role where user = ?");
+		 query.setParameter(1, user); 		
+		return query.getResultList();
+	} 
+
 	@SuppressWarnings("unchecked")
 	public List<Role> getRoles(User user, Conference conf) {
 		 Query query = em.createQuery("from Role role where conference = ? and user = ?");
 		 query.setParameter(1, conf);
-		 query.setParameter(2, user);
-		 		
+		 query.setParameter(2, user);	
 		return query.getResultList();
 	}
 	
+	
+
+	
 
 }
diff --git a/YACOSCore/ejbModule/org/yacos/core/conferences/IConferenceManager.java b/YACOSCore/ejbModule/org/yacos/core/conferences/IConferenceManager.java
index 54fb03c..d2a1410 100644
--- a/YACOSCore/ejbModule/org/yacos/core/conferences/IConferenceManager.java
+++ b/YACOSCore/ejbModule/org/yacos/core/conferences/IConferenceManager.java
@@ -32,7 +32,7 @@ public interface IConferenceManager {
 	//role et user methode
 	public void addRole(Role.RoleType roleType, User user, Conference conf);
 	public void removeRole(Role role);
-	public List<Role> getRoles();
+	public List<Role> getRoles(Conference conf);
 	public List<Role> getRoles(User user, Conference conf);
 	public void updateRole(Role role);
 }
diff --git a/YACOSCore/ejbModule/org/yacos/core/users/UserManagerBean.java b/YACOSCore/ejbModule/org/yacos/core/users/UserManagerBean.java
index 6a75015..c359797 100644
--- a/YACOSCore/ejbModule/org/yacos/core/users/UserManagerBean.java
+++ b/YACOSCore/ejbModule/org/yacos/core/users/UserManagerBean.java
@@ -11,7 +11,9 @@ import javax.persistence.EntityManager;
 import javax.persistence.PersistenceContext;
 import javax.persistence.Query;
 
+import org.yacos.core.conferences.Conference;
 import org.yacos.core.exceptions.PKAlreadyUsedException;
+import org.yacos.core.users.Role.RoleType;
 
 /**
  * @author christiancorsano
@@ -66,9 +68,14 @@ public class UserManagerBean implements IUserManager{
 	  return (this.getUser(login)!= null); 
 	}
 
-	public List<Role> getRoles() {
+	public List<User> getUsers(Conference conf) {
 		// TODO Auto-generated method stub
-		return em.createQuery("from Role").getResultList();
+		return null;
+	}
+
+	public List<User> getUsers(RoleType type) {
+		// TODO Auto-generated method stub
+		return null;
 	}
 	
 }