Index: Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Data/GrassCoverErosionOutwardsFailureMechanismSectionResultAssemblyFactory.cs
===================================================================
diff -u -rd7589adaf9e021df52e1535e826e0dc37c184cd6 -r6ccafc15e8b0afd7263f00ca0edfa7b475c85cab
--- Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Data/GrassCoverErosionOutwardsFailureMechanismSectionResultAssemblyFactory.cs	(.../GrassCoverErosionOutwardsFailureMechanismSectionResultAssemblyFactory.cs)	(revision d7589adaf9e021df52e1535e826e0dc37c184cd6)
+++ Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Data/GrassCoverErosionOutwardsFailureMechanismSectionResultAssemblyFactory.cs	(.../GrassCoverErosionOutwardsFailureMechanismSectionResultAssemblyFactory.cs)	(revision 6ccafc15e8b0afd7263f00ca0edfa7b475c85cab)
@@ -132,5 +132,41 @@
                 throw new AssemblyException(e.Message, e);
             }
         }
+
+        /// <summary>
+        /// Assembles the combined assessment results.
+        /// </summary>
+        /// <param name="failureMechanismSectionResult">The failure mechanism section result to assemble the 
+        /// combined assembly results for.</param>
+        /// <returns>A <see cref="FailureMechanismSectionAssembly"/> based on the <paramref name="failureMechanismSectionResult"/>.</returns>
+        /// <exception cref="ArgumentNullException">Thrown when <paramref name="failureMechanismSectionResult"/>
+        /// is <c>null</c>.</exception>
+        /// <exception cref="AssemblyException">Thrown when the <see cref="FailureMechanismSectionAssembly"/>
+        /// could not be created.</exception>
+        public static FailureMechanismSectionAssemblyCategoryGroup AssembleCombinedAssessment(
+            GrassCoverErosionOutwardsFailureMechanismSectionResult failureMechanismSectionResult)
+        {
+            if (failureMechanismSectionResult == null)
+            {
+                throw new ArgumentNullException(nameof(failureMechanismSectionResult));
+            }
+
+            FailureMechanismSectionAssemblyCategoryGroup simpleAssembly = AssembleSimpleAssessment(failureMechanismSectionResult);
+            FailureMechanismSectionAssemblyCategoryGroup detailedAssembly = AssembleDetailedAssessment(failureMechanismSectionResult);
+            FailureMechanismSectionAssemblyCategoryGroup tailorMadeAssembly = AssembleTailorMadeAssessment(failureMechanismSectionResult);
+
+            IAssemblyToolCalculatorFactory calculatorFactory = AssemblyToolCalculatorFactory.Instance;
+            IFailureMechanismSectionAssemblyCalculator calculator =
+                calculatorFactory.CreateFailureMechanismSectionAssemblyCalculator(AssemblyToolKernelFactory.Instance);
+
+            try
+            {
+                return calculator.AssembleCombined(simpleAssembly, detailedAssembly, tailorMadeAssembly);
+            }
+            catch (FailureMechanismSectionAssemblyCalculatorException e)
+            {
+                throw new AssemblyException(e.Message, e);
+            }
+        }
     }
 }
\ No newline at end of file
Index: Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Data.Test/GrassCoverErosionOutwardsFailureMechanismSectionResultAssemblyFactoryTest.cs
===================================================================
diff -u -rd7589adaf9e021df52e1535e826e0dc37c184cd6 -r6ccafc15e8b0afd7263f00ca0edfa7b475c85cab
--- Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Data.Test/GrassCoverErosionOutwardsFailureMechanismSectionResultAssemblyFactoryTest.cs	(.../GrassCoverErosionOutwardsFailureMechanismSectionResultAssemblyFactoryTest.cs)	(revision d7589adaf9e021df52e1535e826e0dc37c184cd6)
+++ Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Data.Test/GrassCoverErosionOutwardsFailureMechanismSectionResultAssemblyFactoryTest.cs	(.../GrassCoverErosionOutwardsFailureMechanismSectionResultAssemblyFactoryTest.cs)	(revision 6ccafc15e8b0afd7263f00ca0edfa7b475c85cab)
@@ -151,7 +151,7 @@
 
             using (new AssemblyToolCalculatorFactoryConfig())
             {
-                var calculatorfactory = (TestAssemblyToolCalculatorFactory)AssemblyToolCalculatorFactory.Instance;
+                var calculatorfactory = (TestAssemblyToolCalculatorFactory) AssemblyToolCalculatorFactory.Instance;
                 FailureMechanismSectionAssemblyCalculatorStub calculator = calculatorfactory.LastCreatedFailureMechanismSectionAssemblyCalculator;
 
                 // Call
@@ -175,7 +175,7 @@
 
             using (new AssemblyToolCalculatorFactoryConfig())
             {
-                var calculatorfactory = (TestAssemblyToolCalculatorFactory)AssemblyToolCalculatorFactory.Instance;
+                var calculatorfactory = (TestAssemblyToolCalculatorFactory) AssemblyToolCalculatorFactory.Instance;
                 FailureMechanismSectionAssemblyCalculatorStub calculator = calculatorfactory.LastCreatedFailureMechanismSectionAssemblyCalculator;
 
                 // Call
@@ -196,7 +196,7 @@
 
             using (new AssemblyToolCalculatorFactoryConfig())
             {
-                var calculatorfactory = (TestAssemblyToolCalculatorFactory)AssemblyToolCalculatorFactory.Instance;
+                var calculatorfactory = (TestAssemblyToolCalculatorFactory) AssemblyToolCalculatorFactory.Instance;
                 FailureMechanismSectionAssemblyCalculatorStub calculator = calculatorfactory.LastCreatedFailureMechanismSectionAssemblyCalculator;
                 calculator.ThrowExceptionOnCalculate = true;
 
@@ -239,7 +239,7 @@
 
             using (new AssemblyToolCalculatorFactoryConfig())
             {
-                var calculatorfactory = (TestAssemblyToolCalculatorFactory)AssemblyToolCalculatorFactory.Instance;
+                var calculatorfactory = (TestAssemblyToolCalculatorFactory) AssemblyToolCalculatorFactory.Instance;
                 FailureMechanismSectionAssemblyCalculatorStub calculator = calculatorfactory.LastCreatedFailureMechanismSectionAssemblyCalculator;
 
                 // Call
@@ -259,7 +259,7 @@
 
             using (new AssemblyToolCalculatorFactoryConfig())
             {
-                var calculatorfactory = (TestAssemblyToolCalculatorFactory)AssemblyToolCalculatorFactory.Instance;
+                var calculatorfactory = (TestAssemblyToolCalculatorFactory) AssemblyToolCalculatorFactory.Instance;
                 FailureMechanismSectionAssemblyCalculatorStub calculator = calculatorfactory.LastCreatedFailureMechanismSectionAssemblyCalculator;
 
                 // Call
@@ -280,7 +280,7 @@
 
             using (new AssemblyToolCalculatorFactoryConfig())
             {
-                var calculatorfactory = (TestAssemblyToolCalculatorFactory)AssemblyToolCalculatorFactory.Instance;
+                var calculatorfactory = (TestAssemblyToolCalculatorFactory) AssemblyToolCalculatorFactory.Instance;
                 FailureMechanismSectionAssemblyCalculatorStub calculator = calculatorfactory.LastCreatedFailureMechanismSectionAssemblyCalculator;
                 calculator.ThrowExceptionOnCalculate = true;
 
@@ -296,5 +296,96 @@
         }
 
         #endregion
+
+        #region Combined Assembly
+
+        [Test]
+        public void AssembleCombinedAssessment_FailureMechanismSectionResultNull_ThrowsArgumentNullException()
+        {
+            // Call
+            TestDelegate call = () => GrassCoverErosionOutwardsFailureMechanismSectionResultAssemblyFactory.AssembleCombinedAssessment(
+                null);
+
+            // Assert
+            var exception = Assert.Throws<ArgumentNullException>(call);
+            Assert.AreEqual("failureMechanismSectionResult", exception.ParamName);
+        }
+
+        [Test]
+        public void AssembleCombinedAssessment_WithInput_SetsInputOnCalculator()
+        {
+            // Setup
+            var sectionResult = new GrassCoverErosionOutwardsFailureMechanismSectionResult(FailureMechanismSectionTestFactory.CreateFailureMechanismSection());
+
+            using (new AssemblyToolCalculatorFactoryConfig())
+            {
+                var calculatorFactory = (TestAssemblyToolCalculatorFactory) AssemblyToolCalculatorFactory.Instance;
+                FailureMechanismSectionAssemblyCalculatorStub calculator = calculatorFactory.LastCreatedFailureMechanismSectionAssemblyCalculator;
+
+                // Call
+                GrassCoverErosionOutwardsFailureMechanismSectionResultAssemblyFactory.AssembleCombinedAssessment(
+                    sectionResult);
+
+                // Assert
+                FailureMechanismSectionAssemblyCategoryGroup expectedSimpleAssembly = GrassCoverErosionOutwardsFailureMechanismSectionResultAssemblyFactory.AssembleSimpleAssessment(
+                    sectionResult);
+                FailureMechanismSectionAssemblyCategoryGroup expectedDetailedAssembly = GrassCoverErosionOutwardsFailureMechanismSectionResultAssemblyFactory.AssembleDetailedAssessment(
+                    sectionResult);
+                FailureMechanismSectionAssemblyCategoryGroup expectedTailorMadeAssembly = GrassCoverErosionOutwardsFailureMechanismSectionResultAssemblyFactory.AssembleTailorMadeAssessment(
+                    sectionResult);
+
+                Assert.AreEqual(expectedSimpleAssembly, calculator.CombinedSimpleAssemblyGroupInput);
+                Assert.AreEqual(expectedDetailedAssembly, calculator.CombinedDetailedAssemblyGroupInput);
+                Assert.AreEqual(expectedTailorMadeAssembly, calculator.CombinedTailorMadeAssemblyGroupInput);
+            }
+        }
+
+        [Test]
+        public void AssembleCombinedAssessment_AssemblyRan_ReturnsOutput()
+        {
+            // Setup
+            var sectionResult = new GrassCoverErosionOutwardsFailureMechanismSectionResult(FailureMechanismSectionTestFactory.CreateFailureMechanismSection());
+
+            using (new AssemblyToolCalculatorFactoryConfig())
+            {
+                var calculatorFactory = (TestAssemblyToolCalculatorFactory) AssemblyToolCalculatorFactory.Instance;
+                FailureMechanismSectionAssemblyCalculatorStub calculator = calculatorFactory.LastCreatedFailureMechanismSectionAssemblyCalculator;
+
+                // Call
+                FailureMechanismSectionAssemblyCategoryGroup actualOutput =
+                    GrassCoverErosionOutwardsFailureMechanismSectionResultAssemblyFactory.AssembleCombinedAssessment(
+                        sectionResult);
+
+                // Assert
+                FailureMechanismSectionAssemblyCategoryGroup? calculatorOutput = calculator.CombinedAssemblyCategoryOutput;
+                Assert.AreEqual(calculatorOutput, actualOutput);
+            }
+        }
+
+        [Test]
+        public void AssembleCombinedAssessment_CalculatorThrowsExceptions_ThrowsAssemblyException()
+        {
+            // Setup
+            var sectionResult = new GrassCoverErosionOutwardsFailureMechanismSectionResult(FailureMechanismSectionTestFactory.CreateFailureMechanismSection());
+
+            using (new AssemblyToolCalculatorFactoryConfig())
+            {
+                var calculatorfactory = (TestAssemblyToolCalculatorFactory) AssemblyToolCalculatorFactory.Instance;
+                FailureMechanismSectionAssemblyCalculatorStub calculator = calculatorfactory.LastCreatedFailureMechanismSectionAssemblyCalculator;
+                calculator.ThrowExceptionOnCalculateCombinedAssembly = true;
+
+                // Call
+                TestDelegate call = () => GrassCoverErosionOutwardsFailureMechanismSectionResultAssemblyFactory.AssembleCombinedAssessment(
+                    sectionResult);
+
+                // Assert
+                var exception = Assert.Throws<AssemblyException>(call);
+                Exception innerException = exception.InnerException;
+                Assert.IsInstanceOf<FailureMechanismSectionAssemblyCalculatorException>(innerException);
+                Assert.AreEqual(innerException.Message, exception.Message);
+            }
+        }
+
+        #endregion
     }
 }
\ No newline at end of file