diff --git a/src/Pools/EcsInterfacePool.cs b/src/Pools/EcsInterfacePool.cs
index 8455a7e..6975d19 100644
--- a/src/Pools/EcsInterfacePool.cs
+++ b/src/Pools/EcsInterfacePool.cs
@@ -7,12 +7,18 @@ using System.Threading.Tasks;
 
 namespace DCFApixels.DragonECS
 {
+
     public interface IEcsInterfacePool<T> : IEcsReadonlyPool where T : class
     {
         T Get(int entityID);
     }
+    internal interface IEcsInterfacePoolInternal
+    {
+        void Add(int entityID, object component);
+        void Del(int entityID);
+    }
     public interface IEcsInterfaceComponent { }
-    public class EcsInterfacePool<T> : IEcsPoolImplementation<T>, IEcsInterfacePool<T>, IEnumerable<T> //IEnumerable<T> - IntelliSense hack
+    public class EcsInterfacePool<T> : IEcsPoolImplementation<T>, IEcsInterfacePool<T>, IEcsInterfacePoolInternal, IEnumerable<T> //IEnumerable<T> - IntelliSense hack
         where T : class, IEcsInterfaceComponent
     {
         private EcsWorld _source;
@@ -66,6 +72,17 @@ namespace DCFApixels.DragonECS
         }
         #endregion
 
+        #region IEcsInterfacePoolInternal
+        void IEcsInterfacePoolInternal.Add(int entityID, object component)
+        {
+
+        }
+        void IEcsInterfacePoolInternal.Del(int entityID)
+        {
+
+        }
+        #endregion
+
         #region Other
         object IEcsReadonlyPool.GetRaw(int entityID)
         {
@@ -125,3 +142,152 @@ namespace DCFApixels.DragonECS
         #endregion
     }
 }
+
+
+
+
+
+
+
+
+
+
+
+namespace DCFApixels.DragonECS.Internal
+{
+    internal readonly struct InterfacePoolGraphCmp : IEcsWorldComponent<InterfacePoolGraphCmp>
+    {
+        public readonly InterfacePoolGraph Graph;
+        private InterfacePoolGraphCmp(EcsWorld world)
+        {
+            Graph = new InterfacePoolGraph(world);
+        }
+        public void Init(ref InterfacePoolGraphCmp component, EcsWorld world)
+        {
+            component = new InterfacePoolGraphCmp(world);
+        }
+        public void OnDestroy(ref InterfacePoolGraphCmp component, EcsWorld world)
+        {
+            component = default;
+        }
+    }
+    public class InterfacePoolGraph
+    {
+        private EcsWorld _world;
+        private Dictionary<Type, InterfacePoolBranch> _branches = new Dictionary<Type, InterfacePoolBranch>();
+
+        public InterfacePoolGraph(EcsWorld world)
+        {
+            _world = world;
+        }
+
+        public bool IsInstantiable(Type type)
+        {
+            return _branches.ContainsKey(type);
+        }
+        public bool TryGetBranch(Type type, out InterfacePoolBranch branch)
+        {
+            return _branches.TryGetValue(type, out branch);
+        }
+        public void InitNewInterfacePool(IEcsHybridPoolInternal pool)
+        {
+            foreach (var pair in _branches)
+            {
+                var type = pair.Key;
+                var branch = pair.Value;
+                if (type.IsAssignableFrom(pool.ComponentType))
+                {
+                    if (type == pool.ComponentType)
+                    {
+                        branch.InitRootTypePool(pool);
+                    }
+                    else
+                    {
+                        branch.InitNewPool(pool);
+                    }
+                }
+            }
+        }
+
+        public InterfacePoolBranch GetBranch(Type targetType)
+        {
+            if (_branches.TryGetValue(targetType, out InterfacePoolBranch branch) == false)
+            {
+                branch = new InterfacePoolBranch(_world, targetType, null);
+                _branches.Add(targetType, branch);
+            }
+            return branch;
+        }
+    }
+    public class InterfacePoolBranch
+    {
+        private EcsWorld _world;
+
+        private Type _rootComponentType;
+        private int _rootComponentTypeID;
+        private IEcsHybridPoolInternal _rootTypePool;
+        private List<IEcsHybridPoolInternal> _relatedPools = new List<IEcsHybridPoolInternal>();
+
+        private VirtualHybridPool _virtualPoolRef;
+        private bool _isVirtualPool = false;
+
+        public bool IsVirtualPool
+        {
+            get { return _isVirtualPool; }
+        }
+
+        public HybridPoolBranch(EcsWorld world, Type rootComponentType, IEcsHybridPoolInternal rootTypePool)
+        {
+            _world = world;
+
+            _rootComponentType = rootComponentType;
+            _rootComponentTypeID = world.GetComponentTypeID(rootComponentType);
+
+            if (rootTypePool == null)
+            {
+                _virtualPoolRef = new VirtualHybridPool(world, rootComponentType);
+                rootTypePool = _virtualPoolRef;
+                _isVirtualPool = true;
+            }
+            _rootTypePool = rootTypePool;
+        }
+
+
+        public void InitRootTypePool(IEcsHybridPoolInternal rootTypePool)
+        {
+            if (_isVirtualPool == false)
+            {
+                Throw.UndefinedException();
+            }
+            _isVirtualPool = false;
+            rootTypePool.Devirtualize(_virtualPoolRef);
+            _rootTypePool = rootTypePool;
+            _virtualPoolRef = null;
+        }
+        public void InitNewPool(IEcsHybridPoolInternal pool)
+        {
+            _relatedPools.Add(pool);
+        }
+
+        public void Set(int entityID, object component)
+        {
+            throw new NotImplementedException();
+        }
+        public void Add(int entityID, object component)
+        {
+            _rootTypePool.AddRefInternal(entityID, component, true);
+            foreach (var pool in _relatedPools)
+            {
+                pool.AddRefInternal(entityID, component, false);
+            }
+        }
+        public void Del(int entityID)
+        {
+            _rootTypePool.DelInternal(entityID, true);
+            foreach (var pool in _relatedPools)
+            {
+                pool.DelInternal(entityID, false);
+            }
+        }
+    }
+}