diff --git a/Yavsc/Models/IT/Evolution/Feature.cs b/Yavsc/Models/IT/Evolution/Feature.cs
new file mode 100644
index 00000000..bf01011e
--- /dev/null
+++ b/Yavsc/Models/IT/Evolution/Feature.cs
@@ -0,0 +1,14 @@
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Yavsc.Models.IT.Maintaining
+{
+    public class Feature
+    {
+        [Key,DatabaseGenerated(DatabaseGeneratedOption.Identity)]
+        public long Id { get; set; }
+        public string ShortName { get; set; }
+        public string Description { get; set; }
+        public FeatureStatus Status { get; set; }
+    }
+}
\ No newline at end of file
diff --git a/Yavsc/Models/IT/Evolution/FeatureStatus.cs b/Yavsc/Models/IT/Evolution/FeatureStatus.cs
new file mode 100644
index 00000000..e961aca5
--- /dev/null
+++ b/Yavsc/Models/IT/Evolution/FeatureStatus.cs
@@ -0,0 +1,20 @@
+namespace Yavsc.Models.IT.Maintaining
+{
+    /// <summary>
+    /// A Feature status
+    /// <c>Ko</c>: A Bug has just been discovered
+    /// <c>InSane</c>: This feature is not correctly integrating its ecosystem
+    /// <c>Obsolete</c>: This will be replaced in a short future, or yet has been replaced
+    /// with a better solution.
+    /// <c>Ok</c> : nothing to say
+    /// </summary>
+    public enum FeatureStatus: int
+    {
+        Ko,
+        Ok,
+        ToDoInterface,
+        ToDoImplementation,
+        ToDoModel,
+        ToDoSpecifications
+    }
+}
\ No newline at end of file
diff --git a/Yavsc/Models/IT/Fixing/Bug.cs b/Yavsc/Models/IT/Fixing/Bug.cs
new file mode 100644
index 00000000..8596ebf9
--- /dev/null
+++ b/Yavsc/Models/IT/Fixing/Bug.cs
@@ -0,0 +1,15 @@
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Yavsc.Models.IT.Fixing
+{
+    public class Bug
+    {
+        [Key,DatabaseGenerated(DatabaseGeneratedOption.Identity)]
+        public long Id { get; set; }
+        public long FeatureId { get; set; }
+
+        public BugStatus Status { get; set; }
+        
+    }
+}
\ No newline at end of file
diff --git a/Yavsc/Models/IT/Fixing/BugStatus.cs b/Yavsc/Models/IT/Fixing/BugStatus.cs
new file mode 100644
index 00000000..1e5d148e
--- /dev/null
+++ b/Yavsc/Models/IT/Fixing/BugStatus.cs
@@ -0,0 +1,19 @@
+namespace Yavsc.Models.IT.Fixing
+{
+    /// <summary>
+    /// Bug status:
+    /// * Inserted -> Confirmed|FeatureRequest|Feature|Rejected
+    /// * Confirmed -> Fixed
+    /// * FeatureRequest -> Implemented
+    /// </summary>
+    public enum BugStatus : int
+    {
+        Inserted,
+        Confirmed,
+        Rejected,
+        Feature,
+        FeatureRequest,
+        Fixed,
+        Implemented
+    }
+}
\ No newline at end of file