Index: Ringtoets/StabilityStoneCover/src/Ringtoets.StabilityStoneCover.Data/StabilityStoneCoverFailureMechanismAssemblyFactory.cs
===================================================================
diff -u -r8d9701fc88424972b9f06c3e9f28fc55d85bebd9 -rda4f6a1d33595ff3f3a057c82c33fed131c2790e
--- Ringtoets/StabilityStoneCover/src/Ringtoets.StabilityStoneCover.Data/StabilityStoneCoverFailureMechanismAssemblyFactory.cs	(.../StabilityStoneCoverFailureMechanismAssemblyFactory.cs)	(revision 8d9701fc88424972b9f06c3e9f28fc55d85bebd9)
+++ Ringtoets/StabilityStoneCover/src/Ringtoets.StabilityStoneCover.Data/StabilityStoneCoverFailureMechanismAssemblyFactory.cs	(.../StabilityStoneCoverFailureMechanismAssemblyFactory.cs)	(revision da4f6a1d33595ff3f3a057c82c33fed131c2790e)
@@ -71,7 +71,7 @@
         }
 
         /// <summary>
-        /// Assembles the detailed assessment results.
+        /// Assembles the detailed assessment result.
         /// </summary>
         /// <param name="failureMechanismSectionResult">The failure mechanism section result to assemble the 
         /// detailed assembly results for.</param>
@@ -107,7 +107,7 @@
         }
 
         /// <summary>
-        /// Assembles the tailor made assessment results.
+        /// Assembles the tailor made assessment result.
         /// </summary>
         /// <param name="failureMechanismSectionResult">The failure mechanism section result to assemble the 
         /// tailor made assembly results for.</param>
@@ -139,7 +139,7 @@
         }
 
         /// <summary>
-        /// Assembles the combined assessment results.
+        /// Assembles the combined assembly.
         /// </summary>
         /// <param name="failureMechanismSectionResult">The failure mechanism section result to assemble the 
         /// combined assembly results for.</param>
@@ -184,19 +184,22 @@
         /// Gets the assembly category group of the given <paramref name="failureMechanismSectionResult"/>.
         /// </summary>
         /// <param name="failureMechanismSectionResult">The failure mechanism section result to get the assembly category group for.</param>
+        /// <param name="useManual">Indicator that determines whether the manual assembly should be used or ignored, regardless of
+        /// the value of <see cref="StabilityStoneCoverFailureMechanismSectionResult.UseManualAssemblyCategoryGroup"/>.</param>
         /// <returns>A <see cref="FailureMechanismSectionAssemblyCategoryGroup"/>.</returns>
         /// <exception cref="ArgumentNullException">Thrown when <paramref name="failureMechanismSectionResult"/> is <c>null</c>.</exception>
         /// <exception cref="AssemblyException">Thrown when the <see cref="FailureMechanismSectionAssemblyCategoryGroup"/>
         /// could not be created.</exception>
         public static FailureMechanismSectionAssemblyCategoryGroup GetSectionAssemblyCategoryGroup(
-            StabilityStoneCoverFailureMechanismSectionResult failureMechanismSectionResult)
+            StabilityStoneCoverFailureMechanismSectionResult failureMechanismSectionResult,
+            bool useManual)
         {
             if (failureMechanismSectionResult == null)
             {
                 throw new ArgumentNullException(nameof(failureMechanismSectionResult));
             }
 
-            return failureMechanismSectionResult.UseManualAssemblyCategoryGroup
+            return failureMechanismSectionResult.UseManualAssemblyCategoryGroup && useManual
                        ? failureMechanismSectionResult.ManualAssemblyCategoryGroup
                        : AssembleCombinedAssessment(failureMechanismSectionResult);
         }
@@ -205,12 +208,15 @@
         /// Assembles the failure mechanism assembly.
         /// </summary>
         /// <param name="failureMechanism">The failure mechanism to assemble for.</param>
+        /// <param name="useManual">Indicator that determines whether the manual assembly should be used or ignored, regardless of
+        /// the value of <see cref="StabilityStoneCoverFailureMechanismSectionResult.UseManualAssemblyCategoryGroup"/>.</param>
         /// <returns>A <see cref="FailureMechanismAssemblyCategoryGroup"/>.</returns>
         /// <exception cref="ArgumentNullException">Thrown when <paramref name="failureMechanism"/>
         /// is <c>null</c>.</exception>
         /// <exception cref="AssemblyException">Thrown when the <see cref="FailureMechanismAssemblyCategoryGroup"/>
         /// could not be created.</exception>
-        public static FailureMechanismAssemblyCategoryGroup AssembleFailureMechanism(StabilityStoneCoverFailureMechanism failureMechanism)
+        public static FailureMechanismAssemblyCategoryGroup AssembleFailureMechanism(StabilityStoneCoverFailureMechanism failureMechanism,
+                                                                                     bool useManual)
         {
             if (failureMechanism == null)
             {
@@ -225,7 +231,7 @@
             try
             {
                 IEnumerable<FailureMechanismSectionAssemblyCategoryGroup> sectionAssemblies =
-                    failureMechanism.SectionResults.Select(GetSectionAssemblyCategoryGroup).ToArray();
+                    failureMechanism.SectionResults.Select(result => GetSectionAssemblyCategoryGroup(result, useManual)).ToArray();
 
                 IAssemblyToolCalculatorFactory calculatorFactory = AssemblyToolCalculatorFactory.Instance;
                 IFailureMechanismAssemblyCalculator calculator =
Index: Ringtoets/StabilityStoneCover/src/Ringtoets.StabilityStoneCover.Forms/Views/StabilityStoneCoverResultView.cs
===================================================================
diff -u -r7adc47fc72205078d054034bb9d1028c32434e28 -rda4f6a1d33595ff3f3a057c82c33fed131c2790e
--- Ringtoets/StabilityStoneCover/src/Ringtoets.StabilityStoneCover.Forms/Views/StabilityStoneCoverResultView.cs	(.../StabilityStoneCoverResultView.cs)	(revision 7adc47fc72205078d054034bb9d1028c32434e28)
+++ Ringtoets/StabilityStoneCover/src/Ringtoets.StabilityStoneCover.Forms/Views/StabilityStoneCoverResultView.cs	(.../StabilityStoneCoverResultView.cs)	(revision da4f6a1d33595ff3f3a057c82c33fed131c2790e)
@@ -138,7 +138,7 @@
 
         protected override void UpdateAssemblyResultControl()
         {
-            FailureMechanismAssemblyResultControl.SetAssemblyResult(StabilityStoneCoverFailureMechanismAssemblyFactory.AssembleFailureMechanism(FailureMechanism));
+            FailureMechanismAssemblyResultControl.SetAssemblyResult(StabilityStoneCoverFailureMechanismAssemblyFactory.AssembleFailureMechanism(FailureMechanism, true));
         }
 
         protected override bool HasManualAssemblyResults()
Index: Ringtoets/StabilityStoneCover/test/Ringtoets.StabilityStoneCover.Data.Test/StabilityStoneCoverFailureMechanismAssemblyFactoryTest.cs
===================================================================
diff -u -rc1ad8e8431d65da2f22adeb93f9deddd9fae77e3 -rda4f6a1d33595ff3f3a057c82c33fed131c2790e
--- Ringtoets/StabilityStoneCover/test/Ringtoets.StabilityStoneCover.Data.Test/StabilityStoneCoverFailureMechanismAssemblyFactoryTest.cs	(.../StabilityStoneCoverFailureMechanismAssemblyFactoryTest.cs)	(revision c1ad8e8431d65da2f22adeb93f9deddd9fae77e3)
+++ Ringtoets/StabilityStoneCover/test/Ringtoets.StabilityStoneCover.Data.Test/StabilityStoneCoverFailureMechanismAssemblyFactoryTest.cs	(.../StabilityStoneCoverFailureMechanismAssemblyFactoryTest.cs)	(revision da4f6a1d33595ff3f3a057c82c33fed131c2790e)
@@ -429,7 +429,8 @@
         {
             // Call
             TestDelegate call = () => StabilityStoneCoverFailureMechanismAssemblyFactory.GetSectionAssemblyCategoryGroup(
-                null);
+                null,
+                new Random(39).NextBoolean());
 
             // Assert
             var exception = Assert.Throws<ArgumentNullException>(call);
@@ -449,7 +450,8 @@
 
                 // Call
                 StabilityStoneCoverFailureMechanismAssemblyFactory.GetSectionAssemblyCategoryGroup(
-                    sectionResult);
+                    sectionResult,
+                    new Random(39).NextBoolean());
 
                 // Assert
                 FailureMechanismSectionAssemblyCategoryGroup expectedSimpleAssembly = StabilityStoneCoverFailureMechanismAssemblyFactory.AssembleSimpleAssessment(
@@ -475,7 +477,8 @@
             {
                 // Call
                 FailureMechanismSectionAssemblyCategoryGroup categoryGroup = StabilityStoneCoverFailureMechanismAssemblyFactory.GetSectionAssemblyCategoryGroup(
-                    sectionResult);
+                    sectionResult,
+                    new Random(39).NextBoolean());
 
                 // Assert
                 FailureMechanismSectionAssemblyCategoryGroup expectedAssembly = StabilityStoneCoverFailureMechanismAssemblyFactory.AssembleCombinedAssessment(
@@ -485,7 +488,7 @@
         }
 
         [Test]
-        public void GetSectionAssemblyCategoryGroup_WithManualInput_ReturnsOutput()
+        public void GetSectionAssemblyCategoryGroup_WithManualInputAndUseManualTrue_ReturnsOutput()
         {
             // Setup
             var sectionResult = new StabilityStoneCoverFailureMechanismSectionResult(FailureMechanismSectionTestFactory.CreateFailureMechanismSection())
@@ -496,27 +499,52 @@
 
             // Call
             FailureMechanismSectionAssemblyCategoryGroup categoryGroup = StabilityStoneCoverFailureMechanismAssemblyFactory.GetSectionAssemblyCategoryGroup(
-                sectionResult);
+                sectionResult,
+                true);
 
             // Assert
             Assert.AreEqual(sectionResult.ManualAssemblyCategoryGroup, categoryGroup);
         }
 
         [Test]
+        public void GetSectionAssemblyCategoryGroup_WithManualInputAndUseManualFalse_ReturnsOutput()
+        {
+            // Setup
+            var random = new Random(39);
+            var sectionResult = new StabilityStoneCoverFailureMechanismSectionResult(FailureMechanismSectionTestFactory.CreateFailureMechanismSection())
+            {
+                UseManualAssemblyCategoryGroup = true,
+                ManualAssemblyCategoryGroup = random.NextEnumValue<FailureMechanismSectionAssemblyCategoryGroup>(),
+                TailorMadeAssessmentResult = random.NextEnumValue<TailorMadeAssessmentCategoryGroupResultType>()
+            };
+
+            // Call
+            FailureMechanismSectionAssemblyCategoryGroup categoryGroup = StabilityStoneCoverFailureMechanismAssemblyFactory.GetSectionAssemblyCategoryGroup(
+                sectionResult,
+                false);
+
+            // Assert
+            FailureMechanismSectionAssemblyCategoryGroup expectedAssembly = StabilityStoneCoverFailureMechanismAssemblyFactory.AssembleCombinedAssessment(
+                sectionResult);
+            Assert.AreEqual(expectedAssembly, categoryGroup);
+        }
+
+        [Test]
         public void GetSectionAssemblyCategoryGroup_WithoutManualInputAndCalculatorThrowsException_ThrowsAssemblyException()
         {
             // Setup
             var sectionResult = new StabilityStoneCoverFailureMechanismSectionResult(FailureMechanismSectionTestFactory.CreateFailureMechanismSection());
 
             using (new AssemblyToolCalculatorFactoryConfig())
             {
-                var calculatorfactory = (TestAssemblyToolCalculatorFactory) AssemblyToolCalculatorFactory.Instance;
-                FailureMechanismSectionAssemblyCalculatorStub calculator = calculatorfactory.LastCreatedFailureMechanismSectionAssemblyCalculator;
+                var calculatorFactory = (TestAssemblyToolCalculatorFactory) AssemblyToolCalculatorFactory.Instance;
+                FailureMechanismSectionAssemblyCalculatorStub calculator = calculatorFactory.LastCreatedFailureMechanismSectionAssemblyCalculator;
                 calculator.ThrowExceptionOnCalculateCombinedAssembly = true;
 
                 // Call
                 TestDelegate call = () => StabilityStoneCoverFailureMechanismAssemblyFactory.GetSectionAssemblyCategoryGroup(
-                    sectionResult);
+                    sectionResult,
+                    new Random(39).NextBoolean());
 
                 // Assert
                 var exception = Assert.Throws<AssemblyException>(call);
@@ -534,14 +562,39 @@
         public void AssembleFailureMechanism_FailureMechanismNull_ThrowsArgumentNullException()
         {
             // Call
-            TestDelegate call = () => StabilityStoneCoverFailureMechanismAssemblyFactory.AssembleFailureMechanism(null);
+            TestDelegate call = () => StabilityStoneCoverFailureMechanismAssemblyFactory.AssembleFailureMechanism(null, new Random(39).NextBoolean());
 
             // Assert
             var exception = Assert.Throws<ArgumentNullException>(call);
             Assert.AreEqual("failureMechanism", exception.ParamName);
         }
 
         [Test]
+        public void AssembleFailureMechanism_WithoutManualInput_SetsInputOnCalculator()
+        {
+            // Setup
+            var failureMechanism = new StabilityStoneCoverFailureMechanism();
+            FailureMechanismTestHelper.SetSections(failureMechanism, new[]
+            {
+                FailureMechanismSectionTestFactory.CreateFailureMechanismSection()
+            });
+
+            using (new AssemblyToolCalculatorFactoryConfig())
+            {
+                var calculatorFactory = (TestAssemblyToolCalculatorFactory) AssemblyToolCalculatorFactory.Instance;
+                FailureMechanismAssemblyCalculatorStub calculator = calculatorFactory.LastCreatedFailureMechanismAssemblyCalculator;
+
+                // Call
+                StabilityStoneCoverFailureMechanismAssemblyFactory.AssembleFailureMechanism(failureMechanism, new Random(39).NextBoolean());
+
+                // Assert
+                FailureMechanismSectionAssemblyCategoryGroup assemblyCategory =
+                    StabilityStoneCoverFailureMechanismAssemblyFactory.AssembleCombinedAssessment(failureMechanism.SectionResults.Single());
+                Assert.AreEqual(assemblyCategory, calculator.FailureMechanismSectionCategories.Single());
+            }
+        }
+
+        [Test]
         public void AssembleFailureMechanism_FailureMechanismIsNotRelevant_ReturnsNotApplicableCategory()
         {
             // Setup
@@ -551,39 +604,40 @@
             };
 
             // Call
-            FailureMechanismAssemblyCategoryGroup category = StabilityStoneCoverFailureMechanismAssemblyFactory.AssembleFailureMechanism(failureMechanism);
+            FailureMechanismAssemblyCategoryGroup category = StabilityStoneCoverFailureMechanismAssemblyFactory.AssembleFailureMechanism(failureMechanism, new Random(39).NextBoolean());
 
             // Assert
             Assert.AreEqual(FailureMechanismAssemblyResultFactory.CreateNotApplicableCategory(), category);
         }
 
         [Test]
-        public void AssembleFailureMechanism_WithoutManualInput_SetsInputOnCalculator()
+        public void AssembleFailureMechanism_WithManualInputAndUseManualTrue_SetsInputOnCalculator()
         {
             // Setup
             var failureMechanism = new StabilityStoneCoverFailureMechanism();
             FailureMechanismTestHelper.SetSections(failureMechanism, new[]
             {
                 FailureMechanismSectionTestFactory.CreateFailureMechanismSection()
             });
+            StabilityStoneCoverFailureMechanismSectionResult sectionResult = failureMechanism.SectionResults.Single();
+            sectionResult.UseManualAssemblyCategoryGroup = true;
+            sectionResult.ManualAssemblyCategoryGroup = new Random(39).NextEnumValue<FailureMechanismSectionAssemblyCategoryGroup>();
 
             using (new AssemblyToolCalculatorFactoryConfig())
             {
                 var calculatorFactory = (TestAssemblyToolCalculatorFactory) AssemblyToolCalculatorFactory.Instance;
                 FailureMechanismAssemblyCalculatorStub calculator = calculatorFactory.LastCreatedFailureMechanismAssemblyCalculator;
 
                 // Call
-                StabilityStoneCoverFailureMechanismAssemblyFactory.AssembleFailureMechanism(failureMechanism);
+                StabilityStoneCoverFailureMechanismAssemblyFactory.AssembleFailureMechanism(failureMechanism, true);
 
                 // Assert
-                FailureMechanismSectionAssemblyCategoryGroup assemblyCategory =
-                    StabilityStoneCoverFailureMechanismAssemblyFactory.AssembleCombinedAssessment(failureMechanism.SectionResults.Single());
-                Assert.AreEqual(assemblyCategory, calculator.FailureMechanismSectionCategories.Single());
+                Assert.AreEqual(sectionResult.ManualAssemblyCategoryGroup, calculator.FailureMechanismSectionCategories.Single());
             }
         }
 
         [Test]
-        public void AssembleFailureMechanism_WithManualInput_SetsInputOnCalculator()
+        public void AssembleFailureMechanism_WithManualInputAndUseManualFalse_SetsNoInputOnCalculator()
         {
             // Setup
             var failureMechanism = new StabilityStoneCoverFailureMechanism();
@@ -593,18 +647,20 @@
             });
             StabilityStoneCoverFailureMechanismSectionResult sectionResult = failureMechanism.SectionResults.Single();
             sectionResult.UseManualAssemblyCategoryGroup = true;
-            sectionResult.ManualAssemblyCategoryGroup = new Random(39).NextEnumValue<FailureMechanismSectionAssemblyCategoryGroup>();
+            sectionResult.ManualAssemblyCategoryGroup = FailureMechanismSectionAssemblyCategoryGroup.IIv;
 
             using (new AssemblyToolCalculatorFactoryConfig())
             {
                 var calculatorFactory = (TestAssemblyToolCalculatorFactory) AssemblyToolCalculatorFactory.Instance;
                 FailureMechanismAssemblyCalculatorStub calculator = calculatorFactory.LastCreatedFailureMechanismAssemblyCalculator;
 
                 // Call
-                StabilityStoneCoverFailureMechanismAssemblyFactory.AssembleFailureMechanism(failureMechanism);
+                StabilityStoneCoverFailureMechanismAssemblyFactory.AssembleFailureMechanism(failureMechanism, false);
 
                 // Assert
-                Assert.AreEqual(sectionResult.ManualAssemblyCategoryGroup, calculator.FailureMechanismSectionCategories.Single());
+                FailureMechanismSectionAssemblyCategoryGroup expectedAssembly = StabilityStoneCoverFailureMechanismAssemblyFactory.AssembleCombinedAssessment(
+                    failureMechanism.SectionResults.Single());
+                Assert.AreEqual(expectedAssembly, calculator.FailureMechanismSectionCategories.Single());
             }
         }
 
@@ -619,7 +675,8 @@
 
                 // Call
                 FailureMechanismAssemblyCategoryGroup actualOutput =
-                    StabilityStoneCoverFailureMechanismAssemblyFactory.AssembleFailureMechanism(new StabilityStoneCoverFailureMechanism());
+                    StabilityStoneCoverFailureMechanismAssemblyFactory.AssembleFailureMechanism(new StabilityStoneCoverFailureMechanism(),
+                                                                                                new Random(39).NextBoolean());
 
                 // Assert
                 Assert.AreEqual(calculator.FailureMechanismAssemblyCategoryGroupOutput, actualOutput);
@@ -632,12 +689,14 @@
             // Setup
             using (new AssemblyToolCalculatorFactoryConfig())
             {
-                var calculatorfactory = (TestAssemblyToolCalculatorFactory) AssemblyToolCalculatorFactory.Instance;
-                FailureMechanismAssemblyCalculatorStub calculator = calculatorfactory.LastCreatedFailureMechanismAssemblyCalculator;
+                var calculatorFactory = (TestAssemblyToolCalculatorFactory) AssemblyToolCalculatorFactory.Instance;
+                FailureMechanismAssemblyCalculatorStub calculator = calculatorFactory.LastCreatedFailureMechanismAssemblyCalculator;
                 calculator.ThrowExceptionOnCalculate = true;
 
                 // Call
-                TestDelegate call = () => StabilityStoneCoverFailureMechanismAssemblyFactory.AssembleFailureMechanism(new StabilityStoneCoverFailureMechanism());
+                TestDelegate call = () => StabilityStoneCoverFailureMechanismAssemblyFactory.AssembleFailureMechanism(
+                    new StabilityStoneCoverFailureMechanism(),
+                    new Random(39).NextBoolean());
 
                 // Assert
                 var exception = Assert.Throws<AssemblyException>(call);
@@ -659,12 +718,13 @@
 
             using (new AssemblyToolCalculatorFactoryConfig())
             {
-                var calculatorfactory = (TestAssemblyToolCalculatorFactory) AssemblyToolCalculatorFactory.Instance;
-                FailureMechanismSectionAssemblyCalculatorStub calculator = calculatorfactory.LastCreatedFailureMechanismSectionAssemblyCalculator;
+                var calculatorFactory = (TestAssemblyToolCalculatorFactory) AssemblyToolCalculatorFactory.Instance;
+                FailureMechanismSectionAssemblyCalculatorStub calculator = calculatorFactory.LastCreatedFailureMechanismSectionAssemblyCalculator;
                 calculator.ThrowExceptionOnCalculate = true;
 
                 // Call
-                TestDelegate call = () => StabilityStoneCoverFailureMechanismAssemblyFactory.AssembleFailureMechanism(failureMechanism);
+                TestDelegate call = () => StabilityStoneCoverFailureMechanismAssemblyFactory.AssembleFailureMechanism(failureMechanism,
+                                                                                                                      new Random(39).NextBoolean());
 
                 // Assert
                 var exception = Assert.Throws<AssemblyException>(call);