diff --git a/yavscModel/ChangeLog b/yavscModel/ChangeLog
index 68590a83..cf157d07 100644
--- a/yavscModel/ChangeLog
+++ b/yavscModel/ChangeLog
@@ -1,3 +1,12 @@
+2015-11-23  Paul Schneider  <paul@pschneider.fr>
+
+	* Estimate.cs:
+	* IContentProvider.cs: refactorisation fournisseurs
+
+	* IDataProvider.cs: Permet aux fournisseurs d'identifier les
+	contenus avec un type de donnée arbitraire,
+	du moment que ce type identifie les contenus.
+
 2015-11-23  Paul Schneider  <paul@pschneider.fr>
 
 	* Manager.cs: implémente la fonction de construction des
diff --git a/yavscModel/WorkFlow/Estimate.cs b/yavscModel/WorkFlow/Estimate.cs
index 783bd949..7a83f919 100644
--- a/yavscModel/WorkFlow/Estimate.cs
+++ b/yavscModel/WorkFlow/Estimate.cs
@@ -8,7 +8,7 @@ namespace Yavsc.Model.WorkFlow
 	/// Estimate.
 	/// </summary>
 	[Serializable]
-	public class Estimate : ITitle
+	public class Estimate : ITitle, IIdentified<long>
 	{
 		/// <summary>
 		/// Initializes a new instance of the <see cref="Yavsc.Model.WorkFlow.Estimate"/> class.
diff --git a/yavscModel/WorkFlow/IContentProvider.cs b/yavscModel/WorkFlow/IContentProvider.cs
index 38748d12..5f0d3bf9 100644
--- a/yavscModel/WorkFlow/IContentProvider.cs
+++ b/yavscModel/WorkFlow/IContentProvider.cs
@@ -9,7 +9,7 @@ namespace Yavsc.Model.WorkFlow
 	/// Interface content provider.
 	/// Class Assertion: <c>Statuses.Length &gt;= FinalStatuses.Length</c>.
 	/// </summary>
-	public interface IContentProvider : IDbModule, IDisposable, IDataProvider<Estimate>
+	public interface IContentProvider : IDbModule, IDisposable, IDataProvider<Estimate,long>
 	{
 
 		/// <summary>
diff --git a/yavscModel/WorkFlow/IDataProvider.cs b/yavscModel/WorkFlow/IDataProvider.cs
index 84dc0bbd..6468ff9a 100644
--- a/yavscModel/WorkFlow/IDataProvider.cs
+++ b/yavscModel/WorkFlow/IDataProvider.cs
@@ -7,13 +7,13 @@ namespace Yavsc.Model.WorkFlow
 	/// <summary>
 	/// I data provider.
 	/// </summary>
-	public interface IDataProvider<T>
+	public interface IDataProvider<T,IDT> where T : IIdentified<IDT>
 	{
 		/// <summary>
 		/// Get the specified id.
 		/// </summary>
 		/// <param name="id">Identifier.</param>
-		T Get (long id);
+		T Get (IDT id);
 		/// <summary>
 		/// Update the specified data.
 		/// </summary>