Index: Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Plugin/ClosingStructuresPlugin.cs
===================================================================
diff -u -r0320ab3a413cb6a55e3f615d8c62706a48121588 -r6b8f6422c0a6f96f8e563bb6afb82a7a192142b4
--- Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Plugin/ClosingStructuresPlugin.cs	(.../ClosingStructuresPlugin.cs)	(revision 0320ab3a413cb6a55e3f615d8c62706a48121588)
+++ Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Plugin/ClosingStructuresPlugin.cs	(.../ClosingStructuresPlugin.cs)	(revision 6b8f6422c0a6f96f8e563bb6afb82a7a192142b4)
@@ -368,7 +368,7 @@
             };
         }
 
-        private static IList GetInputs(ClosingStructuresFailureMechanism failureMechanism, IAssessmentSection assessmentSection)
+        private static IEnumerable GetInputs(ClosingStructuresFailureMechanism failureMechanism, IAssessmentSection assessmentSection)
         {
             return new ArrayList
             {
@@ -379,7 +379,7 @@
             };
         }
 
-        private static IList GetOutputs(ClosingStructuresFailureMechanism failureMechanism)
+        private static IEnumerable GetOutputs(ClosingStructuresFailureMechanism failureMechanism)
         {
             return new ArrayList
             {