diff --git a/Yavsc/ApiControllers/BookQueryApiController.cs b/Yavsc/ApiControllers/BookQueryApiController.cs
index 7819434d..ead226c6 100644
--- a/Yavsc/ApiControllers/BookQueryApiController.cs
+++ b/Yavsc/ApiControllers/BookQueryApiController.cs
@@ -34,16 +34,16 @@ namespace Yavsc.Controllers
         /// <param name="maxId">returned Ids must be lower than this value</param>
         /// <returns>book queries</returns>
         [HttpGet]
-        public IEnumerable<BookQueryProviderView> GetCommands(long maxId=long.MaxValue)
+        public IEnumerable<BookQueryProviderInfo> GetCommands(long maxId=long.MaxValue)
         {
             var uid = User.GetUserId();
             var now = DateTime.Now;
             
             var result = _context.Commands.Include(c => c.Location).
             Include(c => c.Client).Where(c => c.PerformerId == uid && c.Id < maxId && c.EventDate > now).
-            Select(c => new BookQueryProviderView
+            Select(c => new BookQueryProviderInfo
             {
-                Client = new ClientProviderView { UserName = c.Client.UserName, UserId = c.ClientId },
+                Client = new ClientProviderInfo { UserName = c.Client.UserName, UserId = c.ClientId },
                 Location = c.Location,
                 EventDate = c.EventDate,
                 Id = c.Id,
diff --git a/Yavsc/Helpers/EventHelpers.cs b/Yavsc/Helpers/EventHelpers.cs
index fbdb614a..610b1e47 100644
--- a/Yavsc/Helpers/EventHelpers.cs
+++ b/Yavsc/Helpers/EventHelpers.cs
@@ -12,7 +12,7 @@ namespace Yavsc.Helpers
         {
             var yaev = new BookQueryEvent
             {
-                Client =  new ClientProviderView { UserName = query.Client.UserName , UserId = query.ClientId }  ,
+                Client =  new ClientProviderInfo { UserName = query.Client.UserName , UserId = query.ClientId }  ,
                 Previsional = query.Previsional,
                 EventDate = query.EventDate,
                 Location = query.Location,
diff --git a/Yavsc/Interfaces/IBookQueryData.cs b/Yavsc/Interfaces/IBookQueryData.cs
new file mode 100644
index 00000000..ab156929
--- /dev/null
+++ b/Yavsc/Interfaces/IBookQueryData.cs
@@ -0,0 +1,14 @@
+using System;
+using Yavsc.Model;
+
+namespace Yavsc.Interfaces
+{
+    public interface IBookQueryData
+    {
+        ClientProviderInfo Client { get; set; }
+        DateTime EventDate { get; set; }
+        long Id { get; set; }
+        Location Location { get; set; }
+        decimal? Previsionnal { get; set; }
+    }
+}
\ No newline at end of file
diff --git a/Yavsc/Interfaces/IEstimate.cs b/Yavsc/Interfaces/IEstimate.cs
new file mode 100644
index 00000000..1c833cc6
--- /dev/null
+++ b/Yavsc/Interfaces/IEstimate.cs
@@ -0,0 +1,19 @@
+namespace Yavsc.Interfaces
+{
+    using System.Collections.Generic;
+    using Yavsc.Models.Billing;
+    public interface IEstimate
+    {
+        List<string> AttachedFiles { get; set; }
+        List<string> AttachedGraphics { get; }
+        List<CommandLine> Bill { get; set; }
+        string ClientId { get; set; }
+        long? CommandId { get; set; }
+        string CommandType { get; set; }
+        string Description { get; set; }
+        long Id { get; set; }
+        string OwnerId { get; set; }
+        int? Status { get; set; }
+        string Title { get; set; }
+    }
+}
\ No newline at end of file
diff --git a/Yavsc/Model/Billing/Estimate.cs b/Yavsc/Model/Billing/Estimate.cs
index ecc0ecc4..c53e6899 100644
--- a/Yavsc/Model/Billing/Estimate.cs
+++ b/Yavsc/Model/Billing/Estimate.cs
@@ -1,13 +1,12 @@
-
-using System.Collections.Generic;
-using System.ComponentModel.DataAnnotations;
-using System.ComponentModel.DataAnnotations.Schema;
-using System.Linq;
-using Yavsc.Models.Booking;
-
 namespace Yavsc.Models.Billing
 {
-    public partial class Estimate
+    using System.Collections.Generic;
+    using System.ComponentModel.DataAnnotations;
+    using System.ComponentModel.DataAnnotations.Schema;
+    using System.Linq;
+    using Yavsc.Interfaces;
+    using Yavsc.Models.Booking;
+    public partial class Estimate : IEstimate
     {
         [Key(), DatabaseGenerated(DatabaseGeneratedOption.Identity)]
         public long Id { get; set; }
@@ -20,7 +19,7 @@ namespace Yavsc.Models.Billing
         /// </summary>
         /// <returns></returns>
         [ForeignKey("CommandId")]
-        public BookQuery Query { get; set; }  
+        public BookQuery Query { get; set; }
         public string Description { get; set; }
         public int? Status { get; set; }
         public string Title { get; set; }
@@ -35,9 +34,10 @@ namespace Yavsc.Models.Billing
         [NotMapped]
         public List<string> AttachedGraphics { get; set; }
 
-        public string AttachedGraphicsString { 
+        public string AttachedGraphicsString
+        {
             get { return string.Join(":", AttachedGraphics); }
-            set { AttachedGraphics = value.Split(':').ToList(); } 
+            set { AttachedGraphics = value.Split(':').ToList(); }
         }
         /// <summary>
         /// List of attached files
@@ -48,9 +48,10 @@ namespace Yavsc.Models.Billing
         /// <returns></returns>
         [NotMapped]
         public List<string> AttachedFiles { get; set; }
-        public string AttachedFilesString {
+        public string AttachedFilesString
+        {
             get { return string.Join(":", AttachedFiles); }
-            set { AttachedFiles = value.Split(':').ToList(); } 
+            set { AttachedFiles = value.Split(':').ToList(); }
         }
 
         [Required]
@@ -58,5 +59,10 @@ namespace Yavsc.Models.Billing
 
         [Required]
         public string ClientId { get; set; }
+
+        public string CommandType
+        {
+            get; set;
+        }
     }
 }
diff --git a/Yavsc/Model/Messaging/BookQueryEvent.cs b/Yavsc/Model/Messaging/BookQueryEvent.cs
index 060e2677..05a80b95 100644
--- a/Yavsc/Model/Messaging/BookQueryEvent.cs
+++ b/Yavsc/Model/Messaging/BookQueryEvent.cs
@@ -24,7 +24,7 @@ using Yavsc.Model;
 //  You should have received a copy of the GNU Lesser General Public License
 //  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-public class BookQueryEvent: BookQueryProviderView, IEvent
+public class BookQueryEvent: BookQueryProviderInfo, IEvent
 	{
         public BookQueryEvent()
         {
diff --git a/Yavsc/Model/Messaging/ClientProviderInfo.cs b/Yavsc/Model/Messaging/ClientProviderInfo.cs
index 7febd680..f1524266 100644
--- a/Yavsc/Model/Messaging/ClientProviderInfo.cs
+++ b/Yavsc/Model/Messaging/ClientProviderInfo.cs
@@ -3,8 +3,8 @@ using System;
 namespace Yavsc.Model
 {
 
-public class BookQueryProviderView { 
-            public ClientProviderView Client { get; set; }
+public class BookQueryProviderInfo { 
+            public ClientProviderInfo Client { get; set; }
             public Location Location { get; set; }
 
             public long Id { get; set; }
@@ -12,7 +12,7 @@ public class BookQueryProviderView { 
             public DateTime EventDate { get ; set; }
             public decimal? Previsional { get; set; }
         }
-        public class ClientProviderView { 
+        public class ClientProviderInfo { 
             public string UserName { get; set; }
             public string UserId { get; set; }
             public int Rate { get; set; }