diff --git a/Sources/Model/InfoTitle.cs b/Sources/Model/InfoTitle.cs
index bb9eb4d..eb4e688 100644
--- a/Sources/Model/InfoTitle.cs
+++ b/Sources/Model/InfoTitle.cs
@@ -17,9 +17,17 @@ public class InfoTitle : Title
         }
     }
 
-    private string description;
+    private string description = "";
 
-    public IEnumerable<Artiste> Feat { get; set; }
+    public IEnumerable<Artiste> Feat
+    {
+        get
+        {
+            return feat;
+        }
+    }
+
+    private List<Artiste> feat = new List<Artiste>();
 
     public Genre Genre { get; set; }
 
@@ -28,19 +36,15 @@ public class InfoTitle : Title
         Artiste = artist;
         Description = description;
         Genre = genre;
-        Feat = new List<Artiste>();
     }
 
     public void AddFeat(Artiste artist)
     {
-        Feat.Prepend(artist);
+        feat.Add(artist);
     }
     public void RemoveFeat(Artiste artiste)
     {
-        foreach (var item in Feat)
-        {
-            Feat = Feat.Where(item => item != artiste).ToList();
-        }
+        feat.Remove(artiste);
     }
 
 }
diff --git a/Sources/Model/Manager.cs b/Sources/Model/Manager.cs
index 9de8d13..4f8e51b 100644
--- a/Sources/Model/Manager.cs
+++ b/Sources/Model/Manager.cs
@@ -4,48 +4,68 @@ public class Manager
 {
     public IDataManager DataManager { get; set; }
 
-    public IEnumerable<Album> Albums;
+    public IEnumerable<Album> Albums
+    {
+        get
+        {
+            return albums;
+        }
+    }
+
+    private List<Album> albums = new List<Album>();
 
-    public IEnumerable<Title> Titles;
+    public IEnumerable<Title> Titles
+    {
+        get
+        {
+            return titles;
+        }
+    }
+
+    private List<Title> titles = new List<Title>();
+
+    public IEnumerable<Playlist> Playlists
+    {
+        get
+        {
+            return playlists;
+        }
+    }
 
-    public IEnumerable<Playlist> Playlists;
+    private List<Playlist> playlists = new List<Playlist>();
 
     public Manager()
     {
         DataManager = new Stub();
-        // Albums = DataManager.GetAlbum(); 
-        Albums = new List<Album>();
-        Titles = new List<Title>();
-        Playlists = new List<Playlist>();
     }
 
     public void AddAlbum(Album album)
     {
-        Albums.Prepend(album);
+        albums.Add(album);
     }
 
     public void AddTitle(Title title)
     {
-        Titles.Prepend(title);
+        titles.Add(title);
     }
     public void AddPlaylist(Playlist playlist)
     {
-        Playlists.Prepend(playlist);
+        playlists.Add(playlist);
     }
 
     public void RemoveAlbum(Album album)
     {
-        Albums.ToList().Remove(album);
+        albums.Remove(album);
     }
 
     public void RemoveTitle(Title title)
     {
-        Titles.ToList().Remove(title);
+        titles.Remove(title);
     }
 
     public void RemovePlaylist(Playlist playlist)
     {
-        Playlists.ToList().Remove(playlist);
+        playlists.Remove(playlist);
     }
 
 }