diff --git a/YACOSCore/ejbModule/org/yacos/core/conferences/ConferenceManagerBean.java b/YACOSCore/ejbModule/org/yacos/core/conferences/ConferenceManagerBean.java
index 429c739..59adaf6 100644
--- a/YACOSCore/ejbModule/org/yacos/core/conferences/ConferenceManagerBean.java
+++ b/YACOSCore/ejbModule/org/yacos/core/conferences/ConferenceManagerBean.java
@@ -81,6 +81,14 @@ public class ConferenceManagerBean implements IConferenceManager {
 		em.remove(role);
 		em.flush();
 	}
+	
+	public void removePCMemberForConf(Integer confId) {
+		Conference conf = em.find(Conference.class, confId);
+		Query query = em.createQuery("delete from Role where conference=? and type=?");
+		query.setParameter(1, conf);
+		query.setParameter(2, RoleType.PCMEMBER);
+		query.executeUpdate();
+	}
 
 	public void updateRole(Role role){
 		em.merge(role);
@@ -170,6 +178,19 @@ public class ConferenceManagerBean implements IConferenceManager {
 		Criterion criterion = new Criterion(name,minRating,maxRating,conf);
 		em.persist(criterion);
 	}
+	
+	public void removeCriterionToConference(Integer conferenceId) {
+		Conference conf = em.find(Conference.class, conferenceId);
+		Query query = em.createQuery("delete from Criterion where conference=?");
+		query.setParameter(1, conf);
+		query.executeUpdate();
+	}
+	
+	public void removeOneCriterionToConference(Criterion criterion) {
+		em.remove(criterion);
+		em.flush();
+	}
+	
 
 	public void addPCMemberToConference(Integer conferenceId, String userLogin) {
 		Conference conf = getConference(conferenceId);
diff --git a/YACOSCore/ejbModule/org/yacos/core/conferences/IConferenceManager.java b/YACOSCore/ejbModule/org/yacos/core/conferences/IConferenceManager.java
index 8006bf7..22a76dc 100644
--- a/YACOSCore/ejbModule/org/yacos/core/conferences/IConferenceManager.java
+++ b/YACOSCore/ejbModule/org/yacos/core/conferences/IConferenceManager.java
@@ -5,6 +5,7 @@ import java.util.List;
 
 import javax.ejb.Remote;
 
+import org.yacos.core.evaluation.Criterion;
 import org.yacos.core.exceptions.ConferenceDoesntExistException;
 import org.yacos.core.system.InvitationToken;
 import org.yacos.core.system.InvitationTokenPK;
@@ -19,7 +20,10 @@ public interface IConferenceManager {
 	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 removeCriterionToConference(Integer conferenceId);
+	public void removeOneCriterionToConference(Criterion criterion);
 	public void addPCMemberToConference(Integer conferenceId, String userLogin);
+	public void removePCMemberForConf(Integer confId);
 	
 	public void remove(Integer conferenceId);
 	public void update(Conference conf);