diff --git a/YACOSCore/ejbModule/org/yacos/core/article/Article.java b/YACOSCore/ejbModule/org/yacos/core/article/Article.java
index b50cd6d..30213d7 100644
--- a/YACOSCore/ejbModule/org/yacos/core/article/Article.java
+++ b/YACOSCore/ejbModule/org/yacos/core/article/Article.java
@@ -7,6 +7,8 @@ import java.util.List;
 
 import javax.persistence.CascadeType;
 import javax.persistence.Entity;
+import javax.persistence.EnumType;
+import javax.persistence.Enumerated;
 import javax.persistence.GeneratedValue;
 import javax.persistence.GenerationType;
 import javax.persistence.Id;
@@ -80,6 +82,7 @@ public class Article implements Serializable {
 	public enum State {
 		SUMMARY, FINAL , REJECTED, ACCEPTED
 	};
+	@Enumerated(EnumType.ORDINAL)
 	private State state;
 
   
@@ -161,10 +164,12 @@ public class Article implements Serializable {
 		this.secondaryAuthors = new ArrayList<String>(secondaryAuthors);
 	}
 
+	@Enumerated(EnumType.ORDINAL)
 	public State getState() {
 		return state;
 	}
 
+	@Enumerated(EnumType.ORDINAL)
 	public void setState(State state) {
 		this.state=state;
 	}
@@ -261,11 +266,11 @@ public class Article implements Serializable {
 		return false;
 	}
 	
-	@OneToMany(targetEntity=Report.class, mappedBy="article", cascade=CascadeType.ALL)
+	@OneToMany(targetEntity=Report.class, mappedBy="article")
 	public Collection<Report> getReport() {
 		return report;
 	}
-	@OneToMany(targetEntity=Report.class, mappedBy="article", cascade=CascadeType.ALL)
+	@OneToMany(targetEntity=Report.class, mappedBy="article")
 	public void setReport(Collection<Report> report) {
 		this.report = report;
 	}
diff --git a/YACOSCore/ejbModule/org/yacos/core/article/ArticleManagerBean.java b/YACOSCore/ejbModule/org/yacos/core/article/ArticleManagerBean.java
index 62ab492..6845236 100644
--- a/YACOSCore/ejbModule/org/yacos/core/article/ArticleManagerBean.java
+++ b/YACOSCore/ejbModule/org/yacos/core/article/ArticleManagerBean.java
@@ -6,15 +6,12 @@ import java.util.List;
 import javax.annotation.Resource;
 import javax.ejb.SessionContext;
 import javax.ejb.Stateless;
-import javax.ejb.TransactionAttribute;
-import javax.ejb.TransactionAttributeType;
 import javax.ejb.TransactionManagement;
 import javax.ejb.TransactionManagementType;
 import javax.persistence.EntityManager;
 import javax.persistence.NoResultException;
 import javax.persistence.PersistenceContext;
 import javax.persistence.Query;
-
 import org.yacos.core.article.Article.State;
 import org.yacos.core.conferences.Conference;
 import org.yacos.core.exceptions.ConferenceDoesntExistException;
@@ -62,7 +59,6 @@ public class ArticleManagerBean implements IArticleManager, Serializable {
 	public void updateArticle(Article article) {
 		em.merge(article);
 		em.flush();
-		
 	}
 
 	public void removeArticle(Integer articleId) {
diff --git a/YACOSCore/ejbModule/org/yacos/core/conferences/Conference.java b/YACOSCore/ejbModule/org/yacos/core/conferences/Conference.java
index cf8b257..5cc2349 100644
--- a/YACOSCore/ejbModule/org/yacos/core/conferences/Conference.java
+++ b/YACOSCore/ejbModule/org/yacos/core/conferences/Conference.java
@@ -4,7 +4,6 @@ import java.io.Serializable;
 import java.util.ArrayList;
 import java.util.Date;
 import java.util.List;
-
 import javax.persistence.CascadeType;
 import javax.persistence.Entity;
 import javax.persistence.GeneratedValue;
@@ -13,7 +12,6 @@ import javax.persistence.Id;
 import javax.persistence.OneToMany;
 import javax.persistence.Temporal;
 import javax.persistence.TemporalType;
-
 import org.yacos.core.article.Article;
 import org.yacos.core.evaluation.Criterion;
 import org.yacos.core.users.Role;
diff --git a/YACOSCore/ejbModule/org/yacos/core/conferences/ConferenceManagerBean.java b/YACOSCore/ejbModule/org/yacos/core/conferences/ConferenceManagerBean.java
index d4bf374..429c739 100644
--- a/YACOSCore/ejbModule/org/yacos/core/conferences/ConferenceManagerBean.java
+++ b/YACOSCore/ejbModule/org/yacos/core/conferences/ConferenceManagerBean.java
@@ -3,16 +3,16 @@ package org.yacos.core.conferences;
 import java.util.ArrayList;
 import java.util.Date;
 import java.util.List;
-
 import javax.ejb.Stateless;
 import javax.persistence.EntityManager;
 import javax.persistence.PersistenceContext;
 import javax.persistence.Query;
-
+import org.yacos.core.evaluation.Criterion;
 import org.yacos.core.exceptions.ConferenceDoesntExistException;
 import org.yacos.core.system.InvitationToken;
 import org.yacos.core.system.InvitationTokenPK;
 import org.yacos.core.users.Role;
+import org.yacos.core.users.RolePK;
 import org.yacos.core.users.User;
 import org.yacos.core.users.Role.RoleType;
 
@@ -164,4 +164,26 @@ public class ConferenceManagerBean implements IConferenceManager {
 		return query.getResultList();
 	}
 
+	public void addCriterionToConference(Integer conferenceId, String name,
+			Integer minRating, Integer maxRating) {
+		Conference conf = getConference(conferenceId);
+		Criterion criterion = new Criterion(name,minRating,maxRating,conf);
+		em.persist(criterion);
+	}
+
+	public void addPCMemberToConference(Integer conferenceId, String userLogin) {
+		Conference conf = getConference(conferenceId);
+		User member = em.find(User.class, userLogin);
+		
+		// First checks if the role already exists, if not create it
+		RolePK memberRolePK = new RolePK(member,RoleType.PCMEMBER,conf);
+		if(em.find(Role.class, memberRolePK)==null){
+			Role memberRole = new Role();
+			memberRole.setType(RoleType.PCMEMBER);
+			memberRole.setUser(member);
+			memberRole.setConference(conf);
+			em.persist(memberRole);
+		}
+	}
+
 }
diff --git a/YACOSCore/ejbModule/org/yacos/core/conferences/IConferenceManager.java b/YACOSCore/ejbModule/org/yacos/core/conferences/IConferenceManager.java
index d332d16..8006bf7 100644
--- a/YACOSCore/ejbModule/org/yacos/core/conferences/IConferenceManager.java
+++ b/YACOSCore/ejbModule/org/yacos/core/conferences/IConferenceManager.java
@@ -18,6 +18,8 @@ public interface IConferenceManager {
 	// CRUD methods
 	public Conference addConference(String titre, String descirption, String infoComplementray, Date dataAbstract, Date dateArticle, Date dateEvaluation, Date dateStart, Date dateEnd);
 	public Conference getConference(Integer id);
+	public void addCriterionToConference(Integer conferenceId,String name,Integer minRating, Integer maxRating);
+	public void addPCMemberToConference(Integer conferenceId, String userLogin);
 	
 	public void remove(Integer conferenceId);
 	public void update(Conference conf);
diff --git a/YACOSCore/ejbModule/org/yacos/core/users/User.java b/YACOSCore/ejbModule/org/yacos/core/users/User.java
index f52177b..ed02029 100644
--- a/YACOSCore/ejbModule/org/yacos/core/users/User.java
+++ b/YACOSCore/ejbModule/org/yacos/core/users/User.java
@@ -13,9 +13,6 @@ import javax.persistence.OneToMany;
 import javax.persistence.Table;
 import javax.persistence.UniqueConstraint;
 
-import org.yacos.core.article.Article;
-import org.yacos.core.conferences.Conference;
-
 
 /**
  * A unique User of the system.
@@ -71,9 +68,6 @@ public class User implements Serializable{
 	@OneToMany(cascade=CascadeType.ALL, targetEntity=Role.class,mappedBy="user")
 	private List<Role> roles;
 	
-	@OneToMany(targetEntity=Article.class,mappedBy="mainAuthor")
-	private List<Article> articles;
-	
 	public User(String login, String password, String firstName,
 			String lastName, String organization, String email) {
 		this();
@@ -172,18 +166,6 @@ public class User implements Serializable{
 	public void setLogin(String login) {
 		this.login = login;
 	}
-
-	
-
-	@OneToMany(targetEntity=Article.class,mappedBy="mainAuthor")
-	public List<Article> getArticles() {
-		return articles;
-	}
-
-	@OneToMany(targetEntity=Article.class,mappedBy="mainAuthor")
-	public void setArticles(List<Article> articles) {
-		this.articles = articles;
-	}
 	
 	public static String hashPassword(String password){
 		try {