diff --git a/YACOSCore/ejbModule/org/yacos/core/article/Article.java b/YACOSCore/ejbModule/org/yacos/core/article/Article.java
index 372f02c..40152f0 100644
--- a/YACOSCore/ejbModule/org/yacos/core/article/Article.java
+++ b/YACOSCore/ejbModule/org/yacos/core/article/Article.java
@@ -11,6 +11,8 @@ import javax.persistence.JoinColumn;
 import javax.persistence.JoinTable;
 import javax.persistence.ManyToMany;
 import javax.persistence.ManyToOne;
+import javax.persistence.OneToMany;
+
 import org.yacos.core.conferences.Conference;
 import org.yacos.core.users.User;
 
@@ -60,6 +62,9 @@ public class Article implements Serializable {
 	)
 	private Collection<User> pcMembers;
 	
+	@OneToMany(targetEntity=Preference.class,mappedBy="article")
+	private Collection<Preference> preferences;
+	
 	private int state;
 
 	public enum state {
@@ -214,7 +219,23 @@ public class Article implements Serializable {
 		this.conference = conference;
 	}
 	
-	public boolean asMember(){
+	/**
+	 * @return the preferences
+	 */
+	@OneToMany(targetEntity=Preference.class,mappedBy="article")
+	public Collection<Preference> getPreferences() {
+		return preferences;
+	}
+
+	/**
+	 * @param preferences the preferences to set
+	 */
+	@OneToMany(targetEntity=Preference.class,mappedBy="article")
+	public void setPreferences(Collection<Preference> preferences) {
+		this.preferences = preferences;
+	}
+
+	public boolean hasMember(){
 		return false;
 	}
 }
diff --git a/YACOSCore/ejbModule/org/yacos/core/article/ArticleManagerBean.java b/YACOSCore/ejbModule/org/yacos/core/article/ArticleManagerBean.java
index ac2f0e2..292e22d 100644
--- a/YACOSCore/ejbModule/org/yacos/core/article/ArticleManagerBean.java
+++ b/YACOSCore/ejbModule/org/yacos/core/article/ArticleManagerBean.java
@@ -5,7 +5,9 @@ import java.util.List;
 
 import javax.ejb.Stateless;
 import javax.persistence.EntityManager;
+import javax.persistence.NoResultException;
 import javax.persistence.PersistenceContext;
+import javax.persistence.Query;
 
 import org.yacos.core.users.User;
 
@@ -65,4 +67,37 @@ public class ArticleManagerBean implements IArticleManager, Serializable {
 	public List<User> getArticleReferees(Article article) {
 		return (List<User>) article.getReferees();
 	}
+
+	public Preference getArticlePreferenceForUser(Article article,
+			String pcMemberLogin) {
+		Query query = em.createQuery("SELECT p FROM Preference p WHERE p.article.id = :articleid AND p.pcMember.id = :pcmemberlogin");
+		query.setParameter("articleid",article.getId());
+		query.setParameter("pcmemberlogin", pcMemberLogin);
+		try {
+			return (Preference) query.getSingleResult();
+		} catch (NoResultException e) {
+			return null;
+		}
+	}
+
+	public void setArticlePreferences(Article article,
+			List<Preference> preferences) {
+		article.setPreferences(preferences);
+	}
+
+	public void addArticlePreference(Preference preference) {
+		if(! em.contains(preference)){
+			em.persist(preference);
+		}
+	}
+
+	public void addArticlePreference(Integer article_id, String userLogin, String preferenceValue) {
+		Preference preference = new Preference();
+		Article article = getArticle(article_id);
+		preference.setArticle(article);
+		User pcMember = em.find(User.class, userLogin);
+		preference.setPcMember(pcMember);
+		preference.setPreference(preferenceValue);
+		em.persist(preference);
+	}
 }
diff --git a/YACOSCore/ejbModule/org/yacos/core/article/IArticleManager.java b/YACOSCore/ejbModule/org/yacos/core/article/IArticleManager.java
index 6ace501..bdc76c5 100644
--- a/YACOSCore/ejbModule/org/yacos/core/article/IArticleManager.java
+++ b/YACOSCore/ejbModule/org/yacos/core/article/IArticleManager.java
@@ -12,6 +12,9 @@ public interface IArticleManager {
 	
 	public List<?> getArticlePCMembers(Article article);
 	public List<?> getArticleReferees(Article article);
+	public Preference getArticlePreferenceForUser(Article article, String pcMemberLogin);
+	public void setArticlePreferences(Article article, List<Preference> preferences);
+	public void addArticlePreference(Integer article_id, String userLogin, String preferenceValue);
 	
 	public List<Article> getArticles();
 }
diff --git a/YACOSCore/ejbModule/org/yacos/core/article/Preference.java b/YACOSCore/ejbModule/org/yacos/core/article/Preference.java
index e194c14..10d206e 100644
--- a/YACOSCore/ejbModule/org/yacos/core/article/Preference.java
+++ b/YACOSCore/ejbModule/org/yacos/core/article/Preference.java
@@ -3,6 +3,8 @@
  */
 package org.yacos.core.article;
 
+import java.io.Serializable;
+
 import javax.persistence.Entity;
 import javax.persistence.GeneratedValue;
 import javax.persistence.GenerationType;
@@ -17,7 +19,11 @@ import org.yacos.core.users.User;
  *
  */
 @Entity
-public class Preference {
+public class Preference implements Serializable {
+	/**
+	 * 
+	 */
+	private static final long serialVersionUID = 1L;
 	/**
 	 * Id mandatory in every entity.
 	 */
@@ -38,6 +44,7 @@ public class Preference {
 	 * @return the id
 	 */
 	@Id
+	@GeneratedValue(strategy=GenerationType.AUTO)
 	public Integer getId() {
 		return id;
 	}
@@ -45,6 +52,7 @@ public class Preference {
 	 * @param id the id to set
 	 */
 	@Id
+	@GeneratedValue(strategy=GenerationType.AUTO)
 	public void setId(Integer id) {
 		this.id = id;
 	}