Index: Riskeer/Common/src/Riskeer.Common.Data/AssemblyTool/FailureMechanismSectionAssemblyGroupFactory.cs
===================================================================
diff -u -r6b3753a9bfc048980b06342b163783b28c2d8a24 -rc292d279a83c6a04d7020f53fff8a2ad99c68b48
--- Riskeer/Common/src/Riskeer.Common.Data/AssemblyTool/FailureMechanismSectionAssemblyGroupFactory.cs	(.../FailureMechanismSectionAssemblyGroupFactory.cs)	(revision 6b3753a9bfc048980b06342b163783b28c2d8a24)
+++ Riskeer/Common/src/Riskeer.Common.Data/AssemblyTool/FailureMechanismSectionAssemblyGroupFactory.cs	(.../FailureMechanismSectionAssemblyGroupFactory.cs)	(revision c292d279a83c6a04d7020f53fff8a2ad99c68b48)
@@ -86,9 +86,8 @@
         /// <param name="refinedProfileProbability">The refined probability for the profile.</param>
         /// <param name="refinedSectionProbability">The refined probability for the section.</param>
         /// <param name="probabilityRefinementType">The <see cref="ProbabilityRefinementType"/> of the section.</param>
-        /// <param name="getNFunc">The <see cref="Func{TResult}"/> to get the N of the section.</param>
-        /// <exception cref="ArgumentNullException">Thrown when <paramref name="assessmentSection"/>
-        /// or <paramref name="getNFunc"/> is <c>null</c>.</exception>
+        /// <param name="sectionN">The N of the section.</param>
+        /// <exception cref="ArgumentNullException">Thrown when <paramref name="assessmentSection"/> is <c>null</c>.</exception>
         /// <exception cref="InvalidEnumArgumentException">Thrown when <paramref name="initialFailureMechanismResultType"/>
         /// or <paramref name="probabilityRefinementType"/> is invalid.</exception>
         /// <exception cref="AssemblyException">Thrown when the section could not be successfully assembled.</exception>
@@ -98,18 +97,13 @@
             double initialProfileProbability, double initialSectionProbability,
             bool furtherAnalysisNeeded,
             double refinedProfileProbability, double refinedSectionProbability,
-            ProbabilityRefinementType probabilityRefinementType, Func<double> getNFunc)
+            ProbabilityRefinementType probabilityRefinementType, double sectionN)
         {
             if (assessmentSection == null)
             {
                 throw new ArgumentNullException(nameof(assessmentSection));
             }
 
-            if (getNFunc == null)
-            {
-                throw new ArgumentNullException(nameof(getNFunc));
-            }
-
             if (!Enum.IsDefined(typeof(AdoptableInitialFailureMechanismResultType), initialFailureMechanismResultType))
             {
                 throw new InvalidEnumArgumentException(nameof(initialFailureMechanismResultType),
@@ -127,7 +121,7 @@
             FailureMechanismSectionAssemblyInput input = CreateInput(
                 assessmentSection, isRelevant, initialFailureMechanismResultType,
                 initialProfileProbability, initialSectionProbability, furtherAnalysisNeeded,
-                refinedProfileProbability, refinedSectionProbability, probabilityRefinementType, getNFunc);
+                refinedProfileProbability, refinedSectionProbability, probabilityRefinementType, sectionN);
 
             return PerformAssembly(input);
         }
@@ -152,10 +146,8 @@
                                                                         double initialProfileProbability, double initialSectionProbability,
                                                                         bool furtherAnalysisNeeded,
                                                                         double refinedProfileProbability, double refinedSectionProbability,
-                                                                        ProbabilityRefinementType probabilityRefinementType, Func<double> getNFunc)
+                                                                        ProbabilityRefinementType probabilityRefinementType, double sectionN)
         {
-            double sectionN = getNFunc();
-
             if (probabilityRefinementType == ProbabilityRefinementType.Profile)
             {
                 refinedSectionProbability = refinedProfileProbability * sectionN;
Index: Riskeer/Common/src/Riskeer.Common.Forms/Views/AdoptableWithProfileProbabilityFailureMechanismSectionResultRow.cs
===================================================================
diff -u -r10fa7dc4e89445117c00b565a973ce4307333f0b -rc292d279a83c6a04d7020f53fff8a2ad99c68b48
--- Riskeer/Common/src/Riskeer.Common.Forms/Views/AdoptableWithProfileProbabilityFailureMechanismSectionResultRow.cs	(.../AdoptableWithProfileProbabilityFailureMechanismSectionResultRow.cs)	(revision 10fa7dc4e89445117c00b565a973ce4307333f0b)
+++ Riskeer/Common/src/Riskeer.Common.Forms/Views/AdoptableWithProfileProbabilityFailureMechanismSectionResultRow.cs	(.../AdoptableWithProfileProbabilityFailureMechanismSectionResultRow.cs)	(revision c292d279a83c6a04d7020f53fff8a2ad99c68b48)
@@ -307,7 +307,7 @@
                     assessmentSection, IsRelevant, InitialFailureMechanismResult, InitialFailureMechanismResultProfileProbability,
                     InitialFailureMechanismResultSectionProbability, FurtherAnalysisNeeded,
                     SectionResult.RefinedProfileProbability, SectionResult.RefinedSectionProbability,
-                    ProbabilityRefinementType, getNFunc);
+                    ProbabilityRefinementType, getNFunc());
             }
             catch (AssemblyException e)
             {
Index: Riskeer/Common/test/Riskeer.Common.Data.Test/AssemblyTool/FailureMechanismSectionAssemblyGroupFactoryTest.cs
===================================================================
diff -u -r6b3753a9bfc048980b06342b163783b28c2d8a24 -rc292d279a83c6a04d7020f53fff8a2ad99c68b48
--- Riskeer/Common/test/Riskeer.Common.Data.Test/AssemblyTool/FailureMechanismSectionAssemblyGroupFactoryTest.cs	(.../FailureMechanismSectionAssemblyGroupFactoryTest.cs)	(revision 6b3753a9bfc048980b06342b163783b28c2d8a24)
+++ Riskeer/Common/test/Riskeer.Common.Data.Test/AssemblyTool/FailureMechanismSectionAssemblyGroupFactoryTest.cs	(.../FailureMechanismSectionAssemblyGroupFactoryTest.cs)	(revision c292d279a83c6a04d7020f53fff8a2ad99c68b48)
@@ -180,31 +180,14 @@
             void Call() => FailureMechanismSectionAssemblyGroupFactory.AssembleSection(
                 null, random.NextBoolean(), random.NextEnumValue<AdoptableInitialFailureMechanismResultType>(), random.NextDouble(),
                 random.NextDouble(), random.NextBoolean(), random.NextDouble(), random.NextDouble(),
-                random.NextEnumValue<ProbabilityRefinementType>(), () => double.NaN);
+                random.NextEnumValue<ProbabilityRefinementType>(), double.NaN);
 
             // Assert
             var exception = Assert.Throws<ArgumentNullException>(Call);
             Assert.AreEqual("assessmentSection", exception.ParamName);
         }
 
         [Test]
-        public void AssembleSectionWithProfileProbability_GetNFuncNull_ThrowsArgumentNullException()
-        {
-            // Setup
-            var random = new Random(21);
-
-            // Call
-            void Call() => FailureMechanismSectionAssemblyGroupFactory.AssembleSection(
-                new AssessmentSectionStub(), random.NextBoolean(), random.NextEnumValue<AdoptableInitialFailureMechanismResultType>(),
-                random.NextDouble(), random.NextDouble(), random.NextBoolean(), random.NextDouble(), random.NextDouble(),
-                random.NextEnumValue<ProbabilityRefinementType>(), null);
-
-            // Assert
-            var exception = Assert.Throws<ArgumentNullException>(Call);
-            Assert.AreEqual("getNFunc", exception.ParamName);
-        }
-
-        [Test]
         public void AssembleSectionWithProfileProbability_InvalidInitialFailureMechanismResultType_ThrowsInvalidEnumArgumentException()
         {
             // Setup
@@ -216,7 +199,7 @@
             void Call() => FailureMechanismSectionAssemblyGroupFactory.AssembleSection(
                 new AssessmentSectionStub(), random.NextBoolean(), initialFailureMechanismResultType,
                 random.NextDouble(), random.NextDouble(), random.NextBoolean(), random.NextDouble(), random.NextDouble(),
-                random.NextEnumValue<ProbabilityRefinementType>(), () => double.NaN);
+                random.NextEnumValue<ProbabilityRefinementType>(), double.NaN);
 
             // Assert
             var expectedMessage = $"The value of argument 'initialFailureMechanismResultType' ({initialFailureMechanismResultType}) is invalid for Enum type '{nameof(AdoptableInitialFailureMechanismResultType)}'.";
@@ -235,7 +218,7 @@
             void Call() => FailureMechanismSectionAssemblyGroupFactory.AssembleSection(
                 new AssessmentSectionStub(), random.NextBoolean(), random.NextEnumValue<AdoptableInitialFailureMechanismResultType>(),
                 random.NextDouble(), random.NextDouble(), random.NextBoolean(), random.NextDouble(), random.NextDouble(),
-                probabilityRefinementType, () => double.NaN);
+                probabilityRefinementType, double.NaN);
 
             // Assert
             var expectedMessage = $"The value of argument 'probabilityRefinementType' ({probabilityRefinementType}) is invalid for Enum type '{nameof(ProbabilityRefinementType)}'.";
@@ -269,7 +252,7 @@
                 FailureMechanismSectionAssemblyGroupFactory.AssembleSection(
                     assessmentSection, isRelevant, initialFailureMechanismResultType, profileProbability, sectionProbability,
                     furtherAnalysisNeeded, refinedProfileProbability, refinedSectionProbability,
-                    ProbabilityRefinementType.Both, () => 1.0);
+                    ProbabilityRefinementType.Both, 1.0);
 
                 // Assert
                 FailureMechanismSectionAssemblyInput calculatorInput = calculator.FailureMechanismSectionAssemblyInput;
@@ -308,7 +291,7 @@
                 FailureMechanismSectionAssemblyGroupFactory.AssembleSection(
                     new AssessmentSectionStub(), random.NextBoolean(), random.NextEnumValue<AdoptableInitialFailureMechanismResultType>(),
                     random.NextDouble(), random.NextDouble(), random.NextBoolean(), refinedProfileProbability, refinedSectionProbability,
-                    probabilityRefinementType, () => 2.0);
+                    probabilityRefinementType, 2.0);
 
                 // Assert
                 FailureMechanismSectionAssemblyInput calculatorInput = calculator.FailureMechanismSectionAssemblyInput;
@@ -333,7 +316,7 @@
                     FailureMechanismSectionAssemblyGroupFactory.AssembleSection(
                         new AssessmentSectionStub(), random.NextBoolean(), random.NextEnumValue<AdoptableInitialFailureMechanismResultType>(),
                         random.NextDouble(), random.NextDouble(), random.NextBoolean(), random.NextDouble(), random.NextDouble(),
-                        random.NextEnumValue<ProbabilityRefinementType>(), () => 1.0);
+                        random.NextEnumValue<ProbabilityRefinementType>(), 1.0);
 
                 // Assert
                 FailureMechanismSectionAssemblyResult calculatorOutput = calculator.FailureMechanismSectionAssemblyResultOutput;
@@ -359,7 +342,7 @@
                 void Call() => FailureMechanismSectionAssemblyGroupFactory.AssembleSection(
                     new AssessmentSectionStub(), random.NextBoolean(), random.NextEnumValue<AdoptableInitialFailureMechanismResultType>(),
                     random.NextDouble(), random.NextDouble(), random.NextBoolean(), random.NextDouble(), random.NextDouble(),
-                    random.NextEnumValue<ProbabilityRefinementType>(), () => double.NaN);
+                    random.NextEnumValue<ProbabilityRefinementType>(), double.NaN);
 
                 // Assert
                 var exception = Assert.Throws<AssemblyException>(Call);