Index: Riskeer/Integration/src/Riskeer.Integration.Data/StandAlone/AssemblyFactories/StandAloneFailureMechanismAssemblyFactory.cs
===================================================================
diff -u -rec2c838182ed237b3abd753347a861857129331b -r252c1d1ac3a5a32b2f78bc0c577f3cf62d60b278
--- Riskeer/Integration/src/Riskeer.Integration.Data/StandAlone/AssemblyFactories/StandAloneFailureMechanismAssemblyFactory.cs	(.../StandAloneFailureMechanismAssemblyFactory.cs)	(revision ec2c838182ed237b3abd753347a861857129331b)
+++ Riskeer/Integration/src/Riskeer.Integration.Data/StandAlone/AssemblyFactories/StandAloneFailureMechanismAssemblyFactory.cs	(.../StandAloneFailureMechanismAssemblyFactory.cs)	(revision 252c1d1ac3a5a32b2f78bc0c577f3cf62d60b278)
@@ -1,16 +1,44 @@
-using Riskeer.AssemblyTool.Data;
+using System;
+using Riskeer.AssemblyTool.Data;
 using Riskeer.Common.Data.AssemblyTool;
 using Riskeer.Common.Data.AssessmentSection;
 using Riskeer.Common.Data.FailureMechanism;
 
 namespace Riskeer.Integration.Data.StandAlone.AssemblyFactories
 {
+    /// <summary>
+    /// Factory for assembling assembly results for a stand alone failure mechanism.
+    /// </summary>
     public static class StandAloneFailureMechanismAssemblyFactory
     {
+        /// <summary>
+        /// Assembles the section based on the input arguments.
+        /// </summary>
+        /// <param name="sectionResult">The section result to assemble.</param>
+        /// <param name="failureMechanism">The failure mechanism the section result belongs to.</param>
+        /// <param name="assessmentSection">The <see cref="IAssessmentSection"/> the section belongs to.</param>
+        /// <returns>A <see cref="FailureMechanismSectionAssemblyResult"/>.</returns>
+        /// <exception cref="ArgumentNullException">Thrown when any argument is <c>null</c>.</exception>
+        /// <exception cref="AssemblyException">Thrown when the section could not be assembled.</exception>
         public static FailureMechanismSectionAssemblyResult AssembleSection(NonAdoptableWithProfileProbabilityFailureMechanismSectionResult sectionResult,
                                                                             IHasGeneralInput failureMechanism,
                                                                             IAssessmentSection assessmentSection)
         {
+            if (sectionResult == null)
+            {
+                throw new ArgumentNullException(nameof(sectionResult));
+            }
+
+            if (failureMechanism == null)
+            {
+                throw new ArgumentNullException(nameof(failureMechanism));
+            }
+
+            if (assessmentSection == null)
+            {
+                throw new ArgumentNullException(nameof(assessmentSection));
+            }
+
             return FailureMechanismSectionAssemblyResultFactory.AssembleSection(sectionResult, assessmentSection, failureMechanism.GeneralInput.ApplyLengthEffectInSection);
         }
     }
Index: Riskeer/Integration/test/Riskeer.Integration.Data.Test/Assembly/StandAloneFailureMechanismAssemblyFactoryTest.cs
===================================================================
diff -u
--- Riskeer/Integration/test/Riskeer.Integration.Data.Test/Assembly/StandAloneFailureMechanismAssemblyFactoryTest.cs	(revision 0)
+++ Riskeer/Integration/test/Riskeer.Integration.Data.Test/Assembly/StandAloneFailureMechanismAssemblyFactoryTest.cs	(revision 252c1d1ac3a5a32b2f78bc0c577f3cf62d60b278)
@@ -0,0 +1,196 @@
+// Copyright (C) Stichting Deltares 2021. All rights reserved.
+//
+// This file is part of Riskeer.
+//
+// Riskeer is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+//
+// All names, logos, and references to "Deltares" are registered trademarks of
+// Stichting Deltares and remain full property of Stichting Deltares at all times.
+// All rights reserved.
+
+using System;
+using Core.Common.TestUtil;
+using NUnit.Framework;
+using Rhino.Mocks;
+using Riskeer.AssemblyTool.Data;
+using Riskeer.AssemblyTool.KernelWrapper.Calculators;
+using Riskeer.AssemblyTool.KernelWrapper.Calculators.Assembly;
+using Riskeer.AssemblyTool.KernelWrapper.TestUtil.Calculators;
+using Riskeer.AssemblyTool.KernelWrapper.TestUtil.Calculators.Assembly;
+using Riskeer.Common.Data.AssessmentSection;
+using Riskeer.Common.Data.Contribution;
+using Riskeer.Common.Data.Exceptions;
+using Riskeer.Common.Data.FailureMechanism;
+using Riskeer.Common.Data.TestUtil;
+using Riskeer.Common.Primitives;
+using Riskeer.Integration.Data.StandAlone.AssemblyFactories;
+
+namespace Riskeer.Integration.Data.Test.Assembly
+{
+    [TestFixture]
+    public class StandAloneFailureMechanismAssemblyFactoryTest
+    {
+        [Test]
+        public void AssembleSection_SectionResultNull_ThrowsArgumentNullException()
+        {
+            // Setup
+            var mocks = new MockRepository();
+            var assessmentSection = mocks.Stub<IAssessmentSection>();
+            mocks.ReplayAll();
+
+            var failureMechanism = new TestFailureMechanism();
+
+            // Call
+            void Call() => StandAloneFailureMechanismAssemblyFactory.AssembleSection(null, failureMechanism, assessmentSection);
+
+            // Assert
+            var exception = Assert.Throws<ArgumentNullException>(Call);
+            Assert.AreEqual("sectionResult", exception.ParamName);
+
+            mocks.VerifyAll();
+        }
+
+        [Test]
+        public void AssembleSection_FailureMechanismNull_ThrowsArgumentNullException()
+        {
+            // Setup
+            var mocks = new MockRepository();
+            var assessmentSection = mocks.Stub<IAssessmentSection>();
+            mocks.ReplayAll();
+
+            FailureMechanismSection section = FailureMechanismSectionTestFactory.CreateFailureMechanismSection();
+            var sectionResult = new NonAdoptableWithProfileProbabilityFailureMechanismSectionResult(section);
+
+            // Call
+            void Call() => StandAloneFailureMechanismAssemblyFactory.AssembleSection(sectionResult, null, assessmentSection);
+
+            // Assert
+            var exception = Assert.Throws<ArgumentNullException>(Call);
+            Assert.AreEqual("failureMechanism", exception.ParamName);
+
+            mocks.VerifyAll();
+        }
+
+        [Test]
+        public void AssembleSection_AssessmentSectionNull_ThrowsArgumentNullException()
+        {
+            // Setup
+            FailureMechanismSection section = FailureMechanismSectionTestFactory.CreateFailureMechanismSection();
+            var sectionResult = new NonAdoptableWithProfileProbabilityFailureMechanismSectionResult(section);
+
+            var failureMechanism = new TestFailureMechanism();
+
+            // Call
+            void Call() => StandAloneFailureMechanismAssemblyFactory.AssembleSection(sectionResult, failureMechanism, null);
+
+            // Assert
+            var exception = Assert.Throws<ArgumentNullException>(Call);
+            Assert.AreEqual("assessmentSection", exception.ParamName);
+        }
+
+        [Test]
+        public void AssembleSection_WithInput_SetsInputOnCalculator()
+        {
+            // Setup
+            var random = new Random(21);
+
+            FailureMechanismSection section = FailureMechanismSectionTestFactory.CreateFailureMechanismSection();
+            var sectionResult = new NonAdoptableWithProfileProbabilityFailureMechanismSectionResult(section)
+            {
+                IsRelevant = random.NextBoolean(),
+                InitialFailureMechanismResultType = NonAdoptableInitialFailureMechanismResultType.Manual,
+                ManualInitialFailureMechanismResultSectionProbability = random.NextDouble(),
+                FurtherAnalysisType = random.NextEnumValue<FailureMechanismSectionResultFurtherAnalysisType>(),
+                RefinedSectionProbability = random.NextDouble()
+            };
+
+            var failureMechanism = new TestFailureMechanism();
+            var assessmentSection = new AssessmentSectionStub();
+
+            using (new AssemblyToolCalculatorFactoryConfig())
+            {
+                var calculatorFactory = (TestAssemblyToolCalculatorFactory) AssemblyToolCalculatorFactory.Instance;
+                FailureMechanismSectionAssemblyCalculatorStub calculator = calculatorFactory.LastCreatedFailureMechanismSectionAssemblyCalculator;
+
+                // Call
+                StandAloneFailureMechanismAssemblyFactory.AssembleSection(sectionResult, failureMechanism, assessmentSection);
+
+                // Assert
+                FailureMechanismSectionAssemblyInput calculatorInput = calculator.FailureMechanismSectionAssemblyInput;
+                FailureMechanismContribution failureMechanismContribution = assessmentSection.FailureMechanismContribution;
+                Assert.AreEqual(failureMechanismContribution.SignalingNorm, calculatorInput.SignalingNorm);
+                Assert.AreEqual(failureMechanismContribution.LowerLimitNorm, calculatorInput.LowerLimitNorm);
+
+                Assert.AreEqual(sectionResult.IsRelevant, calculatorInput.IsRelevant);
+                Assert.IsTrue(calculatorInput.HasProbabilitySpecified);
+
+                Assert.AreEqual(sectionResult.ManualInitialFailureMechanismResultSectionProbability, calculatorInput.InitialSectionProbability);
+                Assert.AreEqual(sectionResult.FurtherAnalysisType, calculatorInput.FurtherAnalysisType);
+                Assert.AreEqual(sectionResult.RefinedSectionProbability, calculatorInput.RefinedSectionProbability);
+            }
+        }
+
+        [Test]
+        public void AssembleSection_CalculatorRan_ReturnsExpectedOutput()
+        {
+            // Setup
+            FailureMechanismSection section = FailureMechanismSectionTestFactory.CreateFailureMechanismSection();
+            var sectionResult = new NonAdoptableWithProfileProbabilityFailureMechanismSectionResult(section);
+
+            var failureMechanism = new TestFailureMechanism();
+            var assessmentSection = new AssessmentSectionStub();
+
+            using (new AssemblyToolCalculatorFactoryConfig())
+            {
+                var calculatorFactory = (TestAssemblyToolCalculatorFactory) AssemblyToolCalculatorFactory.Instance;
+                FailureMechanismSectionAssemblyCalculatorStub calculator = calculatorFactory.LastCreatedFailureMechanismSectionAssemblyCalculator;
+
+                // Call
+                FailureMechanismSectionAssemblyResult result = StandAloneFailureMechanismAssemblyFactory.AssembleSection(
+                    sectionResult, failureMechanism, assessmentSection);
+
+                // Assert
+                Assert.AreSame(calculator.FailureMechanismSectionAssemblyResultOutput, result);
+            }
+        }
+
+        [Test]
+        public void AssembleSection_CalculatorThrowsException_ThrowsAssemblyException()
+        {
+            // Setup
+            FailureMechanismSection section = FailureMechanismSectionTestFactory.CreateFailureMechanismSection();
+            var sectionResult = new NonAdoptableWithProfileProbabilityFailureMechanismSectionResult(section);
+
+            var failureMechanism = new TestFailureMechanism();
+            var assessmentSection = new AssessmentSectionStub();
+
+            using (new AssemblyToolCalculatorFactoryConfig())
+            {
+                var calculatorFactory = (TestAssemblyToolCalculatorFactory) AssemblyToolCalculatorFactory.Instance;
+                FailureMechanismSectionAssemblyCalculatorStub calculator = calculatorFactory.LastCreatedFailureMechanismSectionAssemblyCalculator;
+                calculator.ThrowExceptionOnCalculate = true;
+
+                // Call
+                void Call() => StandAloneFailureMechanismAssemblyFactory.AssembleSection(
+                    sectionResult, failureMechanism, assessmentSection);
+
+                // Assert
+                var exception = Assert.Throws<AssemblyException>(Call);
+                Exception innerException = exception.InnerException;
+                Assert.IsInstanceOf<FailureMechanismSectionAssemblyCalculatorException>(innerException);
+                Assert.AreEqual(innerException.Message, exception.Message);
+            }
+        }
+    }
+}
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