Index: Ringtoets/Common/src/Ringtoets.Common.Data/Calculation/ICalculation.cs
===================================================================
diff -u -r4af59f05cb6ced6464d51c8dff8cb0b8bfca8edd -r28d7428ed418504296e2c686958a4500b910cc32
--- Ringtoets/Common/src/Ringtoets.Common.Data/Calculation/ICalculation.cs	(.../ICalculation.cs)	(revision 4af59f05cb6ced6464d51c8dff8cb0b8bfca8edd)
+++ Ringtoets/Common/src/Ringtoets.Common.Data/Calculation/ICalculation.cs	(.../ICalculation.cs)	(revision 28d7428ed418504296e2c686958a4500b910cc32)
@@ -26,9 +26,14 @@
     /// <summary>
     /// A calculation related object.
     /// </summary>
-    public interface ICalculation : ICalculationItem, ICommentable
+    public interface ICalculation : ICalculationBase, ICommentable
     {
         /// <summary>
+        /// Gets a value indicating whether or not  this calculation item contains calculation outputs.
+        /// </summary>
+        bool HasOutput { get; }
+
+        /// <summary>
         /// Clears the calculated output.
         /// </summary>
         void ClearOutput();