public ActionResult TraceabilityMatrix(string tag)
 {
     using (var ctx = new Entities())
     {
         var list = ctx.GetTraceabilityMatrix(tag).ToList();
         var model = new List<TraceMatrixItemModel>();
         list.ForEach(i => model.Add(new TraceMatrixItemModel(i)));
         return View(model);
     }
 }