diff --git a/DDDCommon.sln b/DDDCommon.sln
new file mode 100644
index 0000000..a8af7ac
--- /dev/null
+++ b/DDDCommon.sln
@@ -0,0 +1,25 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.28803.452
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "DDDCommon", "DDDCommon.csproj", "{9A34CDC8-F596-48CA-B72C-9094629C1CC9}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{9A34CDC8-F596-48CA-B72C-9094629C1CC9}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{9A34CDC8-F596-48CA-B72C-9094629C1CC9}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{9A34CDC8-F596-48CA-B72C-9094629C1CC9}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{9A34CDC8-F596-48CA-B72C-9094629C1CC9}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {8DEA090C-39BC-4155-A46B-7F71B0252C26}
+	EndGlobalSection
+EndGlobal
diff --git a/Utils/ModelState.cs b/Utils/ModelState.cs
new file mode 100644
index 0000000..500374f
--- /dev/null
+++ b/Utils/ModelState.cs
@@ -0,0 +1,28 @@
+using DDDCommon.Domain.Types;
+
+namespace DDDCommon.Utils
+{
+    public enum ModelStates
+    {
+        None = 0,
+        Added = 1,
+        Updated = 2,
+        Removed = 3
+    }
+    public class ModelState<T> : ValueObject
+    {
+        public T Model { get; }
+        public ModelStates State { get; }
+
+        public ModelState(T model, ModelStates state = ModelStates.None)
+        {
+            Model = model;
+            State = state;
+        }
+
+        public ModelState<T> NewState(ModelStates newState)
+        {
+            return new ModelState<T>(Model, newState);
+        }
+    }
+}
diff --git a/Utils/ModelStateList.cs b/Utils/ModelStateList.cs
new file mode 100644
index 0000000..bc26b41
--- /dev/null
+++ b/Utils/ModelStateList.cs
@@ -0,0 +1,63 @@
+using System;
+using System.Collections.Generic;
+
+namespace DDDCommon.Utils
+{
+    public class ModelStateList<T> : IReadOnlyModelStateList<T>
+    {
+        public IReadOnlyList<T> Items => _items;
+
+        public IReadOnlyList<T> AddedItems => _addedItems;
+
+        public IReadOnlyList<(T Old, T New)> UpdatedItems => _updatedItems;
+
+        public IReadOnlyList<T> RemovedItems => _removedItems;
+
+        private readonly List<T> _items;
+        private readonly List<T> _addedItems;
+        private readonly List<(T Old, T New)> _updatedItems;
+        private readonly List<T> _removedItems;
+
+        public ModelStateList(List<T> items = null)
+        {
+            _items = items ?? new List<T>();
+            _addedItems = new List<T>();
+            _updatedItems = new List<(T, T)>();
+            _removedItems = new List<T>();
+        }
+
+        public void SetItems(List<T> items)
+        {
+            ClearAll();
+            if (items != null) _items.AddRange(items);
+        }
+
+        private void ClearAll()
+        {
+            _items.Clear();
+            _addedItems.Clear();
+            _updatedItems.Clear();
+            _removedItems.Clear();
+        }
+
+        public void AddItem(T item)
+        {
+            _items.Add(item);
+            _addedItems.Add(item);
+        }
+
+        public void UpdateItem(T oldItem, T newItem)
+        {
+            var oldItemIndex = _items.IndexOf(oldItem);
+            if (oldItemIndex < 0) throw Errors.NotFound();
+
+            _items[oldItemIndex] = newItem;
+            _updatedItems.Add((oldItem, newItem));
+        }
+
+        public void RemoveItem(T item)
+        {
+            if (_items.Remove(item)) _removedItems.Add(item);
+        }
+    }
+}
\ No newline at end of file