diff --git a/DeedyDesigner/Deedy.Activity/DeedyVisual/IDeedyInput.cs b/DeedyDesigner/Deedy.Activity/DeedyVisual/IDeedyInput.cs
new file mode 100644
index 0000000..a200261
--- /dev/null
+++ b/DeedyDesigner/Deedy.Activity/DeedyVisual/IDeedyInput.cs
@@ -0,0 +1,12 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Deedy.Activity
+{
+    public interface IDeedyInput
+    {
+    }
+}
diff --git a/DeedyDesigner/Deedy.Activity/DeedyVisual/IDeedyViewer.cs b/DeedyDesigner/Deedy.Activity/DeedyVisual/IDeedyViewer.cs
new file mode 100644
index 0000000..dd0379c
--- /dev/null
+++ b/DeedyDesigner/Deedy.Activity/DeedyVisual/IDeedyViewer.cs
@@ -0,0 +1,12 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Deedy.Activity
+{
+    public class IDeedyViewer
+    {
+    }
+}