Index: Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Plugin/MacroStabilityInwardsPlugin.cs
===================================================================
diff -u -rac96d7c315129af851634ed5a4a6800b59ede718 -r6949918830314633db5cc8c16bb2188779fffc93
--- Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Plugin/MacroStabilityInwardsPlugin.cs	(.../MacroStabilityInwardsPlugin.cs)	(revision ac96d7c315129af851634ed5a4a6800b59ede718)
+++ Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Plugin/MacroStabilityInwardsPlugin.cs	(.../MacroStabilityInwardsPlugin.cs)	(revision 6949918830314633db5cc8c16bb2188779fffc93)
@@ -19,7 +19,6 @@
 // Stichting Deltares and remain full property of Stichting Deltares at all times.
 // All rights reserved.
 
-using System.Collections;
 using System.Collections.Generic;
 using System.Drawing;
 using System.Linq;
@@ -686,9 +685,9 @@
             };
         }
 
-        private static IEnumerable GetInputs(MacroStabilityInwardsFailureMechanism failureMechanism, IAssessmentSection assessmentSection)
+        private static IEnumerable<object> GetInputs(MacroStabilityInwardsFailureMechanism failureMechanism, IAssessmentSection assessmentSection)
         {
-            return new ArrayList
+            return new object[]
             {
                 new FailureMechanismSectionsContext(failureMechanism, assessmentSection),
                 new MacroStabilityInwardsSurfaceLinesContext(failureMechanism.SurfaceLines, failureMechanism, assessmentSection),
@@ -697,9 +696,9 @@
             };
         }
 
-        private static IEnumerable GetOutputs(MacroStabilityInwardsFailureMechanism failureMechanism)
+        private static IEnumerable<object> GetOutputs(MacroStabilityInwardsFailureMechanism failureMechanism)
         {
-            return new ArrayList
+            return new object[]
             {
                 new MacroStabilityInwardsScenariosContext(failureMechanism.CalculationsGroup, failureMechanism),
                 new FailureMechanismSectionResultContext<MacroStabilityInwardsFailureMechanismSectionResult>(