Index: Riskeer/MacroStabilityInwards/src/Riskeer.MacroStabilityInwards.Data/MacroStabilityInwardsFailureMechanismSectionResultDetailedAssessmentExtensions.cs
===================================================================
diff -u -r81ff35f292bb938395188b7568235a03d7c19e40 -r30dc5287e714dafbd695b82fbaf868e36ca3c00d
--- Riskeer/MacroStabilityInwards/src/Riskeer.MacroStabilityInwards.Data/MacroStabilityInwardsFailureMechanismSectionResultDetailedAssessmentExtensions.cs	(.../MacroStabilityInwardsFailureMechanismSectionResultDetailedAssessmentExtensions.cs)	(revision 81ff35f292bb938395188b7568235a03d7c19e40)
+++ Riskeer/MacroStabilityInwards/src/Riskeer.MacroStabilityInwards.Data/MacroStabilityInwardsFailureMechanismSectionResultDetailedAssessmentExtensions.cs	(.../MacroStabilityInwardsFailureMechanismSectionResultDetailedAssessmentExtensions.cs)	(revision 30dc5287e714dafbd695b82fbaf868e36ca3c00d)
@@ -39,14 +39,14 @@
         /// </summary>
         /// <param name="sectionResult">The section result to get the detailed assessment probability for.</param>
         /// <param name="calculationScenarios">All calculation scenarios in the failure mechanism.</param>
-        /// <param name="failureMechanism">The failure mechanism the calculations belong to.</param>
+        /// <param name="modelFactor">The model factor used to calculate a reliablity from a stability factor.</param>
         /// <returns>The calculated detailed assessment probability; or <see cref="double.NaN"/> when there
         /// are no relevant calculations, when not all relevant calculations are performed or when the
         /// contribution of the relevant calculations don't add up to 1.</returns>
         /// <exception cref="ArgumentNullException">Thrown when any parameter is <c>null</c>.</exception>
         public static double GetDetailedAssessmentProbability(this MacroStabilityInwardsFailureMechanismSectionResult sectionResult,
                                                               IEnumerable<MacroStabilityInwardsCalculationScenario> calculationScenarios,
-                                                              MacroStabilityInwardsFailureMechanism failureMechanism)
+                                                              double modelFactor)
         {
             if (sectionResult == null)
             {
@@ -58,11 +58,6 @@
                 throw new ArgumentNullException(nameof(calculationScenarios));
             }
 
-            if (failureMechanism == null)
-            {
-                throw new ArgumentNullException(nameof(failureMechanism));
-            }
-
             MacroStabilityInwardsCalculationScenario[] relevantScenarios = sectionResult.GetCalculationScenarios(calculationScenarios).ToArray();
 
             if (relevantScenarios.Length == 0 || !relevantScenarios.All(s => s.HasOutput) || Math.Abs(sectionResult.GetTotalContribution(relevantScenarios) - 1.0) > 1e-6)
@@ -73,7 +68,7 @@
             double totalDetailedAssessmentProbability = 0;
             foreach (MacroStabilityInwardsCalculationScenario scenario in relevantScenarios)
             {
-                DerivedMacroStabilityInwardsOutput derivedOutput = DerivedMacroStabilityInwardsOutputFactory.Create(scenario.Output, failureMechanism);
+                DerivedMacroStabilityInwardsOutput derivedOutput = DerivedMacroStabilityInwardsOutputFactory.Create(scenario.Output, modelFactor);
 
                 totalDetailedAssessmentProbability += derivedOutput.MacroStabilityInwardsProbability * (double) scenario.Contribution;
             }
Index: Riskeer/MacroStabilityInwards/test/Riskeer.MacroStabilityInwards.Data.Test/MacroStabilityInwardsFailureMechanismSectionResultDetailedAssessmentExtensionsTest.cs
===================================================================
diff -u -r81ff35f292bb938395188b7568235a03d7c19e40 -r30dc5287e714dafbd695b82fbaf868e36ca3c00d
--- Riskeer/MacroStabilityInwards/test/Riskeer.MacroStabilityInwards.Data.Test/MacroStabilityInwardsFailureMechanismSectionResultDetailedAssessmentExtensionsTest.cs	(.../MacroStabilityInwardsFailureMechanismSectionResultDetailedAssessmentExtensionsTest.cs)	(revision 81ff35f292bb938395188b7568235a03d7c19e40)
+++ Riskeer/MacroStabilityInwards/test/Riskeer.MacroStabilityInwards.Data.Test/MacroStabilityInwardsFailureMechanismSectionResultDetailedAssessmentExtensionsTest.cs	(.../MacroStabilityInwardsFailureMechanismSectionResultDetailedAssessmentExtensionsTest.cs)	(revision 30dc5287e714dafbd695b82fbaf868e36ca3c00d)
@@ -39,7 +39,7 @@
         {
             // Call
             void Call() => MacroStabilityInwardsFailureMechanismSectionResultDetailedAssessmentExtensions.GetDetailedAssessmentProbability(
-                null, Enumerable.Empty<MacroStabilityInwardsCalculationScenario>(), new MacroStabilityInwardsFailureMechanism());
+                null, Enumerable.Empty<MacroStabilityInwardsCalculationScenario>(), 1.1);
 
             // Assert
             var exception = Assert.Throws<ArgumentNullException>(Call);
@@ -54,34 +54,17 @@
             var failureMechanismSectionResult = new MacroStabilityInwardsFailureMechanismSectionResult(section);
 
             // Call
-            void Call() => failureMechanismSectionResult.GetDetailedAssessmentProbability(null, new MacroStabilityInwardsFailureMechanism());
+            void Call() => failureMechanismSectionResult.GetDetailedAssessmentProbability(null, 1.1);
 
             // Assert
             var exception = Assert.Throws<ArgumentNullException>(Call);
             Assert.AreEqual("calculationScenarios", exception.ParamName);
         }
 
         [Test]
-        public void GetDetailedAssessmentProbability_FailureMechanismNull_ThrowsArgumentNullException()
-        {
-            // Setup
-            FailureMechanismSection section = FailureMechanismSectionTestFactory.CreateFailureMechanismSection();
-            var failureMechanismSectionResult = new MacroStabilityInwardsFailureMechanismSectionResult(section);
-
-            // Call
-            void Call() => failureMechanismSectionResult.GetDetailedAssessmentProbability(Enumerable.Empty<MacroStabilityInwardsCalculationScenario>(), null);
-
-            // Assert
-            var exception = Assert.Throws<ArgumentNullException>(Call);
-            Assert.AreEqual("failureMechanism", exception.ParamName);
-        }
-
-        [Test]
         public void GetDetailedAssessmentProbability_MultipleScenarios_ReturnsValueBasedOnRelevantScenarios()
         {
             // Setup
-            var failureMechanism = new MacroStabilityInwardsFailureMechanism();
-
             FailureMechanismSection section = FailureMechanismSectionTestFactory.CreateFailureMechanismSection();
             var failureMechanismSectionResult = new MacroStabilityInwardsFailureMechanismSectionResult(section);
 
@@ -108,7 +91,7 @@
             };
 
             // Call
-            double detailedAssessmentProbability = failureMechanismSectionResult.GetDetailedAssessmentProbability(calculations, failureMechanism);
+            double detailedAssessmentProbability = failureMechanismSectionResult.GetDetailedAssessmentProbability(calculations, 1.1);
 
             // Assert
             Assert.AreEqual(0.99012835996547233, detailedAssessmentProbability, 1e-8);
@@ -118,14 +101,11 @@
         public void GetDetailedAssessmentProbability_NoScenarios_ReturnsNaN()
         {
             // Setup
-            var failureMechanism = new MacroStabilityInwardsFailureMechanism();
-
             FailureMechanismSection section = FailureMechanismSectionTestFactory.CreateFailureMechanismSection();
             var failureMechanismSectionResult = new MacroStabilityInwardsFailureMechanismSectionResult(section);
 
             // Call
-            double detailedAssessmentProbability = failureMechanismSectionResult.GetDetailedAssessmentProbability(Enumerable.Empty<MacroStabilityInwardsCalculationScenario>(),
-                                                                                                                  failureMechanism);
+            double detailedAssessmentProbability = failureMechanismSectionResult.GetDetailedAssessmentProbability(Enumerable.Empty<MacroStabilityInwardsCalculationScenario>(), 1.1);
 
             // Assert
             Assert.IsNaN(detailedAssessmentProbability);
@@ -135,8 +115,6 @@
         public void GetDetailedAssessmentProbability_NoRelevantScenarios_ReturnsNaN()
         {
             // Setup
-            var failureMechanism = new MacroStabilityInwardsFailureMechanism();
-
             FailureMechanismSection section = FailureMechanismSectionTestFactory.CreateFailureMechanismSection();
             var failureMechanismSectionResult = new MacroStabilityInwardsFailureMechanismSectionResult(section);
 
@@ -146,7 +124,7 @@
             };
 
             // Call
-            double detailedAssessmentProbability = failureMechanismSectionResult.GetDetailedAssessmentProbability(calculationScenarios, failureMechanism);
+            double detailedAssessmentProbability = failureMechanismSectionResult.GetDetailedAssessmentProbability(calculationScenarios, 1.1);
 
             // Assert
             Assert.IsNaN(detailedAssessmentProbability);
@@ -156,8 +134,6 @@
         public void GetDetailedAssessmentProbability_ScenarioNotCalculated_ReturnsNaN()
         {
             // Setup
-            var failureMechanism = new MacroStabilityInwardsFailureMechanism();
-
             FailureMechanismSection section = FailureMechanismSectionTestFactory.CreateFailureMechanismSection();
             var failureMechanismSectionResult = new MacroStabilityInwardsFailureMechanismSectionResult(section);
 
@@ -167,7 +143,7 @@
             double detailedAssessmentProbability = failureMechanismSectionResult.GetDetailedAssessmentProbability(new[]
             {
                 macroStabilityInwardsCalculationScenario
-            }, failureMechanism);
+            }, 1.1);
 
             // Assert
             Assert.IsNaN(detailedAssessmentProbability);
@@ -177,8 +153,6 @@
         public void GetDetailedAssessmentProbability_ScenarioWithNaNResults_ReturnsNaN()
         {
             // Setup
-            var failureMechanism = new MacroStabilityInwardsFailureMechanism();
-
             FailureMechanismSection section = FailureMechanismSectionTestFactory.CreateFailureMechanismSection();
             var failureMechanismSectionResult = new MacroStabilityInwardsFailureMechanismSectionResult(section);
 
@@ -202,7 +176,7 @@
             };
 
             // Call
-            double detailedAssessmentProbability = failureMechanismSectionResult.GetDetailedAssessmentProbability(calculations, failureMechanism);
+            double detailedAssessmentProbability = failureMechanismSectionResult.GetDetailedAssessmentProbability(calculations, 1.1);
 
             // Assert
             Assert.IsNaN(detailedAssessmentProbability);
@@ -215,7 +189,6 @@
         public void GetDetailedAssessmentProbability_RelevantScenarioContributionsDoNotAddUpTo1_ReturnNaN(double contributionA, double contributionB)
         {
             // Setup
-            var failureMechanism = new MacroStabilityInwardsFailureMechanism();
             FailureMechanismSection section = FailureMechanismSectionTestFactory.CreateFailureMechanismSection();
             MacroStabilityInwardsCalculationScenario scenarioA = MacroStabilityInwardsCalculationScenarioTestFactory.CreateNotCalculatedMacroStabilityInwardsCalculationScenario(section);
             MacroStabilityInwardsCalculationScenario scenarioB = MacroStabilityInwardsCalculationScenarioTestFactory.CreateNotCalculatedMacroStabilityInwardsCalculationScenario(section);
@@ -229,7 +202,7 @@
             {
                 scenarioA,
                 scenarioB
-            }, failureMechanism);
+            }, 1.1);
 
             // Assert
             Assert.IsNaN(detailedAssessmentProbability);