diff --git a/YACOSCore/ejbModule/org/yacos/core/users/IUserManager.java b/YACOSCore/ejbModule/org/yacos/core/users/IUserManager.java
index 17ac85e..6edbaf5 100644
--- a/YACOSCore/ejbModule/org/yacos/core/users/IUserManager.java
+++ b/YACOSCore/ejbModule/org/yacos/core/users/IUserManager.java
@@ -8,11 +8,17 @@ import org.yacos.core.exceptions.PKAlreadyUsedException;
 
 @Remote
 public interface IUserManager {
+	
+	//crud methode
 	public Collection<User> getUsers();
-	public void addUser(User user) throws PKAlreadyUsedException;
+	public User addUser(String login, String password, String firstName,
+			String lastName, String organization, String email) throws PKAlreadyUsedException;
 	public void removeUser(User user);
 	public User getUser(String login);
 	public void UpdateUser(User user);
-	public Boolean exists(User user);
+	public Boolean exists(String login);
 
+	//role methode
+	public Collection<Role> getRoles();
+		
 }
diff --git a/YACOSCore/ejbModule/org/yacos/core/users/Role.java b/YACOSCore/ejbModule/org/yacos/core/users/Role.java
index 02f23ff..ea71b48 100644
--- a/YACOSCore/ejbModule/org/yacos/core/users/Role.java
+++ b/YACOSCore/ejbModule/org/yacos/core/users/Role.java
@@ -45,6 +45,7 @@ public class Role {
 		AUTHOR,CHAIRMAN,PCMEMBER,REFEREE
 	}
 	
+	@Id
 	@Enumerated(EnumType.ORDINAL)
 	private RoleType type;
 	
diff --git a/YACOSCore/ejbModule/org/yacos/core/users/RolePK.java b/YACOSCore/ejbModule/org/yacos/core/users/RolePK.java
index 7e0e489..0687388 100644
--- a/YACOSCore/ejbModule/org/yacos/core/users/RolePK.java
+++ b/YACOSCore/ejbModule/org/yacos/core/users/RolePK.java
@@ -3,6 +3,7 @@ package org.yacos.core.users;
 import java.io.Serializable;
 
 import org.yacos.core.conferences.Conference;
+import org.yacos.core.users.Role.RoleType;
 
 public class RolePK implements Serializable{
 	
@@ -11,8 +12,18 @@ public class RolePK implements Serializable{
 	 */
 	private static final long serialVersionUID = 1L;
 	
+	private RoleType type;
 	private User user;
 	private Conference conference;
+
+	
+	
+	public RoleType getType() {
+		return type;
+	}
+	public void setType(RoleType type) {
+		this.type = type;
+	}
 	public User getUser() {
 		return user;
 	}
diff --git a/YACOSCore/ejbModule/org/yacos/core/users/UserManagerBean.java b/YACOSCore/ejbModule/org/yacos/core/users/UserManagerBean.java
index 56c82c2..a742d71 100644
--- a/YACOSCore/ejbModule/org/yacos/core/users/UserManagerBean.java
+++ b/YACOSCore/ejbModule/org/yacos/core/users/UserManagerBean.java
@@ -32,13 +32,15 @@ public class UserManagerBean implements IUserManager{
 	 * throw PKAlreadyUsedException if login exist in the DB 
 	 * @param user
 	 */
-	public void addUser(User user) throws PKAlreadyUsedException{
-		if (!this.exists(user)){
+	public User addUser(String login, String password, String firstName,
+			String lastName, String organization, String email) throws PKAlreadyUsedException{
+		
+		if (!this.exists(login)){
+			User user = new User(login, password, firstName, lastName, organization, email);
 			em.persist(user);
+			return user;
 		}
-		else{
-			throw new PKAlreadyUsedException();
-		}
+		else{ throw new PKAlreadyUsedException(); }
 	}
 	
 	/**
@@ -58,9 +60,13 @@ public class UserManagerBean implements IUserManager{
 		em.merge(user);
 	}
 	
-	public Boolean exists(User user){
-	  return (this.getUser(user.getLogin())!= null); 
+	public Boolean exists(String login){
+	  return (this.getUser(login)!= null); 
 	}
 
+	public Collection<Role> getRoles() {
+		// TODO Auto-generated method stub
+		return null;
+	}
 	
 }