Index: Ringtoets/StabilityStoneCover/src/Ringtoets.StabilityStoneCover.Data/StabilityStoneCoverFailureMechanismSectionResultAssemblyFactory.cs
===================================================================
diff -u -r015eb3822c4c4d03e957ab676e5dc4428c46f1eb -r55c76bef68faf4b5681a45030f3a253eb03f92e5
--- Ringtoets/StabilityStoneCover/src/Ringtoets.StabilityStoneCover.Data/StabilityStoneCoverFailureMechanismSectionResultAssemblyFactory.cs	(.../StabilityStoneCoverFailureMechanismSectionResultAssemblyFactory.cs)	(revision 015eb3822c4c4d03e957ab676e5dc4428c46f1eb)
+++ Ringtoets/StabilityStoneCover/src/Ringtoets.StabilityStoneCover.Data/StabilityStoneCoverFailureMechanismSectionResultAssemblyFactory.cs	(.../StabilityStoneCoverFailureMechanismSectionResultAssemblyFactory.cs)	(revision 55c76bef68faf4b5681a45030f3a253eb03f92e5)
@@ -43,7 +43,7 @@
         /// is <c>null</c>.</exception>
         /// <exception cref="AssemblyException">Thrown when the <see cref="FailureMechanismSectionAssembly"/>
         /// could not be created.</exception>
-        public static FailureMechanismSectionAssembly AssembleSimpleAssessment(
+        public static FailureMechanismSectionAssemblyCategoryGroup AssembleSimpleAssessment(
             StabilityStoneCoverFailureMechanismSectionResult failureMechanismSectionResult)
         {
             if (failureMechanismSectionResult == null)
@@ -57,7 +57,7 @@
 
             try
             {
-                return calculator.AssembleSimpleAssessment(failureMechanismSectionResult.SimpleAssessmentResult);
+                return calculator.AssembleSimpleAssessment(failureMechanismSectionResult.SimpleAssessmentResult).Group;
             }
             catch (FailureMechanismSectionAssemblyCalculatorException e)
             {
Index: Ringtoets/StabilityStoneCover/test/Ringtoets.StabilityStoneCover.Data.Test/StabilityStoneCoverFailureMechanismSectionResultAssemblyFactoryTest.cs
===================================================================
diff -u -re3f913fddac4cfa598ef5439ce6b832f354d7dd8 -r55c76bef68faf4b5681a45030f3a253eb03f92e5
--- Ringtoets/StabilityStoneCover/test/Ringtoets.StabilityStoneCover.Data.Test/StabilityStoneCoverFailureMechanismSectionResultAssemblyFactoryTest.cs	(.../StabilityStoneCoverFailureMechanismSectionResultAssemblyFactoryTest.cs)	(revision e3f913fddac4cfa598ef5439ce6b832f354d7dd8)
+++ Ringtoets/StabilityStoneCover/test/Ringtoets.StabilityStoneCover.Data.Test/StabilityStoneCoverFailureMechanismSectionResultAssemblyFactoryTest.cs	(.../StabilityStoneCoverFailureMechanismSectionResultAssemblyFactoryTest.cs)	(revision 55c76bef68faf4b5681a45030f3a253eb03f92e5)
@@ -85,12 +85,11 @@
                 FailureMechanismSectionAssemblyCalculatorStub calculator = calculatorfactory.LastCreatedFailureMechanismSectionAssemblyCalculator;
 
                 // Call
-                FailureMechanismSectionAssembly actualOutput =
+                FailureMechanismSectionAssemblyCategoryGroup actualOutput =
                     StabilityStoneCoverFailureMechanismSectionResultAssemblyFactory.AssembleSimpleAssessment(sectionResult);
 
                 // Assert
-                FailureMechanismSectionAssembly calculatorOutput = calculator.SimpleAssessmentAssemblyOutput;
-                Assert.AreSame(calculatorOutput, actualOutput);
+                Assert.AreEqual(calculator.SimpleAssessmentAssemblyOutput.Group, actualOutput);
             }
         }