Index: Riskeer/Piping/src/Riskeer.Piping.Plugin/PipingPlugin.cs
===================================================================
diff -u -ra13bd1b93f177cf300337fd36b3a6ac3b948ecce -r40aef93935efc6585533d5885a20a6f3524e9875
--- Riskeer/Piping/src/Riskeer.Piping.Plugin/PipingPlugin.cs	(.../PipingPlugin.cs)	(revision a13bd1b93f177cf300337fd36b3a6ac3b948ecce)
+++ Riskeer/Piping/src/Riskeer.Piping.Plugin/PipingPlugin.cs	(.../PipingPlugin.cs)	(revision 40aef93935efc6585533d5885a20a6f3524e9875)
@@ -1314,7 +1314,7 @@
         /// <param name="pipingCalculations">The calculations to validate.</param>
         /// <param name="generalPipingInput">The general input to use during the validation.</param>
         /// <param name="assessmentSection">The assessment section the <paramref name="pipingCalculations"/> belong to.</param>
-        /// <param name="failureMechanism">The failure mechanism to use during the validation.</param>
+        /// <param name="failureMechanism">The failure mechanism the <paramref name="pipingCalculations"/> belong to.</param>
         /// <exception cref="NotSupportedException">Thrown when any of the provided calculations is of a type that is not supported.</exception>
         private static void ValidateAll(IEnumerable<IPipingCalculationScenario<PipingInput>> pipingCalculations,
                                         GeneralPipingInput generalPipingInput,
Index: Riskeer/Piping/test/Riskeer.Piping.Service.Test/Probabilistic/ProbabilisticPipingCalculationServiceTest.cs
===================================================================
diff -u -r50df1781e18d8f7077e4247e8b71c2e0c9e6d55d -r40aef93935efc6585533d5885a20a6f3524e9875
--- Riskeer/Piping/test/Riskeer.Piping.Service.Test/Probabilistic/ProbabilisticPipingCalculationServiceTest.cs	(.../ProbabilisticPipingCalculationServiceTest.cs)	(revision 50df1781e18d8f7077e4247e8b71c2e0c9e6d55d)
+++ Riskeer/Piping/test/Riskeer.Piping.Service.Test/Probabilistic/ProbabilisticPipingCalculationServiceTest.cs	(.../ProbabilisticPipingCalculationServiceTest.cs)	(revision 40aef93935efc6585533d5885a20a6f3524e9875)
@@ -116,37 +116,37 @@
         }
 
         [Test]
-        public void Validate_AssessmentSectionNull_ThrowsArgumentNullException()
+        public void Validate_FailureMechanismNull_ThrowsArgumentNullException()
         {
+            // Setup
+            var mocks = new MockRepository();
+            var assessmentSection = mocks.Stub<IAssessmentSection>();
+            mocks.ReplayAll();
+
             // Call
             void Call() => ProbabilisticPipingCalculationService.Validate(new TestProbabilisticPipingCalculation(),
                                                                           new GeneralPipingInput(),
-                                                                          null,
-                                                                          new PipingFailureMechanism());
+                                                                          assessmentSection,
+                                                                          null);
 
             // Assert
             var exception = Assert.Throws<ArgumentNullException>(Call);
-            Assert.AreEqual("assessmentSection", exception.ParamName);
+            Assert.AreEqual("failureMechanism", exception.ParamName);
+            mocks.VerifyAll();
         }
 
         [Test]
-        public void ValidateFailureMechanismNull_ThrowsArgumentNullException()
+        public void Validate_AssessmentSectionNull_ThrowsArgumentNullException()
         {
-            // Setup
-            var mocks = new MockRepository();
-            var assessmentSection = mocks.Stub<IAssessmentSection>();
-            mocks.ReplayAll();
-
             // Call
             void Call() => ProbabilisticPipingCalculationService.Validate(new TestProbabilisticPipingCalculation(),
                                                                           new GeneralPipingInput(),
-                                                                          assessmentSection,
-                                                                          null);
+                                                                          null,
+                                                                          new PipingFailureMechanism());
 
             // Assert
             var exception = Assert.Throws<ArgumentNullException>(Call);
-            Assert.AreEqual("failureMechanism", exception.ParamName);
-            mocks.VerifyAll();
+            Assert.AreEqual("assessmentSection", exception.ParamName);
         }
 
         [Test]
@@ -1012,7 +1012,7 @@
         }
 
         [Test]
-        public void Validate_CalculationWithoutSection_LogsMessage()
+        public void Validate_FailureMechanismWithoutSections_LogsMessageAndReturnsFalse()
         {
             // Setup
             var failureMechanism = new PipingFailureMechanism();
@@ -1044,7 +1044,7 @@
         }
 
         [Test]
-        public void Validate_CalculationInMultipleSections_LogsMessageOnlyForDuplicateSection()
+        public void Validate_CalculationInMultipleSections_LogsMessageAndReturnsFalse()
         {
             // Setup
             var failureMechanism = new PipingFailureMechanism();