diff --git a/YACOSCore/ejbModule/org/yacos/core/users/IUserManager.java b/YACOSCore/ejbModule/org/yacos/core/users/IUserManager.java
new file mode 100644
index 0000000..3b07cda
--- /dev/null
+++ b/YACOSCore/ejbModule/org/yacos/core/users/IUserManager.java
@@ -0,0 +1,18 @@
+package org.yacos.core.users;
+
+import java.util.Collection;
+
+import javax.ejb.Remote;
+
+import org.yacos.core.exceptions.PKAlreadyUsedException;
+
+@Remote
+public interface IUserManager {
+	public Collection<User> getUsers();
+	public void addUser(User user) throws PKAlreadyUsedException;
+	public void removeUser(User user);
+	public User getUser(String login);
+	public void UpdateUser(User user);
+	public Boolean existe(User user);
+
+}