Index: Ringtoets/Common/test/Ringtoets.Common.Data.Test/FailureMechanism/FailureMechanismBaseTest.cs
===================================================================
diff -u -r05685e09226026b830d0d84359c700b7c61ed64d -rcf98e706be0f7385dcf2082da2fe615e7c66f44e
--- Ringtoets/Common/test/Ringtoets.Common.Data.Test/FailureMechanism/FailureMechanismBaseTest.cs	(.../FailureMechanismBaseTest.cs)	(revision 05685e09226026b830d0d84359c700b7c61ed64d)
+++ Ringtoets/Common/test/Ringtoets.Common.Data.Test/FailureMechanism/FailureMechanismBaseTest.cs	(.../FailureMechanismBaseTest.cs)	(revision cf98e706be0f7385dcf2082da2fe615e7c66f44e)
@@ -146,7 +146,7 @@
 
             // Assert
             var exception = Assert.Throws<ArgumentNullException>(call);
-            Assert.AreEqual("sections", exception.ParamName);
+            Assert.AreEqual("failureMechanismSections", exception.ParamName);
         }
 
         [Test]
Index: Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Plugin.Test/TreeNodeInfos/MacroStabilityInwardsCalculationGroupContextTreeNodeInfoTest.cs
===================================================================
diff -u -rb7c9234daf5a52422362a7cb3fa1f46a86df63bb -rcf98e706be0f7385dcf2082da2fe615e7c66f44e
--- Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Plugin.Test/TreeNodeInfos/MacroStabilityInwardsCalculationGroupContextTreeNodeInfoTest.cs	(.../MacroStabilityInwardsCalculationGroupContextTreeNodeInfoTest.cs)	(revision b7c9234daf5a52422362a7cb3fa1f46a86df63bb)
+++ Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Plugin.Test/TreeNodeInfos/MacroStabilityInwardsCalculationGroupContextTreeNodeInfoTest.cs	(.../MacroStabilityInwardsCalculationGroupContextTreeNodeInfoTest.cs)	(revision cf98e706be0f7385dcf2082da2fe615e7c66f44e)
@@ -1091,18 +1091,20 @@
                     surfaceLine1,
                     surfaceLine2
                 };
-                failureMechanism.AddSectionResult(new FailureMechanismSection("Section 1", new List<Point2D>
+                failureMechanism.AddSections(new[]
                 {
-                    new Point2D(0.0, 0.0),
-                    new Point2D(5.0, 0.0)
-                }));
+                    new FailureMechanismSection("Section 1", new List<Point2D>
+                    {
+                        new Point2D(0.0, 0.0),
+                        new Point2D(5.0, 0.0)
+                    }),
+                    new FailureMechanismSection("Section 2", new List<Point2D>
+                    {
+                        new Point2D(5.0, 0.0),
+                        new Point2D(10.0, 0.0)
+                    })
+                });
 
-                failureMechanism.AddSectionResult(new FailureMechanismSection("Section 2", new List<Point2D>
-                {
-                    new Point2D(5.0, 0.0),
-                    new Point2D(10.0, 0.0)
-                }));
-
                 var nodeData = new MacroStabilityInwardsCalculationGroupContext(failureMechanism.CalculationsGroup,
                                                                                 null,
                                                                                 surfaceLines,
@@ -1200,18 +1202,20 @@
                     surfaceLine1,
                     surfaceLine2
                 };
-                failureMechanism.AddSectionResult(new FailureMechanismSection("Section 1", new List<Point2D>
+                failureMechanism.AddSections(new[]
                 {
-                    new Point2D(0.0, 0.0),
-                    new Point2D(5.0, 0.0)
-                }));
+                    new FailureMechanismSection("Section 1", new List<Point2D>
+                    {
+                        new Point2D(0.0, 0.0),
+                        new Point2D(5.0, 0.0)
+                    }),
+                    new FailureMechanismSection("Section 2", new List<Point2D>
+                    {
+                        new Point2D(5.0, 0.0),
+                        new Point2D(10.0, 0.0)
+                    })
+                });
 
-                failureMechanism.AddSectionResult(new FailureMechanismSection("Section 2", new List<Point2D>
-                {
-                    new Point2D(5.0, 0.0),
-                    new Point2D(10.0, 0.0)
-                }));
-
                 var nodeData = new MacroStabilityInwardsCalculationGroupContext(group,
                                                                                 null,
                                                                                 surfaceLines,
Index: Ringtoets/StabilityPointStructures/test/Ringtoets.StabilityPointStructures.Forms.Test/PropertyClasses/StabilityPointStructuresInputContextPropertiesTest.cs
===================================================================
diff -u -rea7fd6455177ea93f8419e6a29fc00d1d3167359 -rcf98e706be0f7385dcf2082da2fe615e7c66f44e
--- Ringtoets/StabilityPointStructures/test/Ringtoets.StabilityPointStructures.Forms.Test/PropertyClasses/StabilityPointStructuresInputContextPropertiesTest.cs	(.../StabilityPointStructuresInputContextPropertiesTest.cs)	(revision ea7fd6455177ea93f8419e6a29fc00d1d3167359)
+++ Ringtoets/StabilityPointStructures/test/Ringtoets.StabilityPointStructures.Forms.Test/PropertyClasses/StabilityPointStructuresInputContextPropertiesTest.cs	(.../StabilityPointStructuresInputContextPropertiesTest.cs)	(revision cf98e706be0f7385dcf2082da2fe615e7c66f44e)
@@ -31,7 +31,6 @@
 using Rhino.Mocks;
 using Ringtoets.Common.Data.AssessmentSection;
 using Ringtoets.Common.Data.DikeProfiles;
-using Ringtoets.Common.Data.FailureMechanism;
 using Ringtoets.Common.Data.Structures;
 using Ringtoets.Common.Data.TestUtil;
 using Ringtoets.Common.Forms.PropertyClasses;
@@ -1457,11 +1456,14 @@
             var handler = new SetPropertyValueAfterConfirmationParameterTester(Enumerable.Empty<IObservable>());
             var properties = new StabilityPointStructuresInputContextProperties(inputContext, handler);
 
-            failureMechanism.AddSectionResult(FailureMechanismSectionTestFactory.CreateFailureMechanismSection(new[]
+            failureMechanism.AddSections(new[]
             {
-                new Point2D(-10.0, -10.0),
-                new Point2D(10.0, 10.0)
-            }));
+                FailureMechanismSectionTestFactory.CreateFailureMechanismSection(new[]
+                {
+                    new Point2D(-10.0, -10.0),
+                    new Point2D(10.0, 10.0)
+                })
+            });
             failureMechanism.CalculationsGroup.Children.Add(calculation);
 
             // Call
Index: Ringtoets/StabilityPointStructures/test/Ringtoets.StabilityPointStructures.Plugin.Test/FileImporters/StabilityPointStructuresUpdateDataStrategyTest.cs
===================================================================
diff -u -r93ba687d7de78eb3e5835a34843b3057c76336bf -rcf98e706be0f7385dcf2082da2fe615e7c66f44e
--- Ringtoets/StabilityPointStructures/test/Ringtoets.StabilityPointStructures.Plugin.Test/FileImporters/StabilityPointStructuresUpdateDataStrategyTest.cs	(.../StabilityPointStructuresUpdateDataStrategyTest.cs)	(revision 93ba687d7de78eb3e5835a34843b3057c76336bf)
+++ Ringtoets/StabilityPointStructures/test/Ringtoets.StabilityPointStructures.Plugin.Test/FileImporters/StabilityPointStructuresUpdateDataStrategyTest.cs	(.../StabilityPointStructuresUpdateDataStrategyTest.cs)	(revision cf98e706be0f7385dcf2082da2fe615e7c66f44e)
@@ -140,7 +140,7 @@
             }, sourceFilePath);
 
             var readStructure = new TestStabilityPointStructure("read id");
-            var importedStructures = new[]
+            TestStabilityPointStructure[] importedStructures =
             {
                 readStructure
             };
@@ -176,7 +176,7 @@
             }, sourceFilePath);
 
             var readStructure = new TestStabilityPointStructure(commonId, "new name");
-            var importedStructures = new[]
+            TestStabilityPointStructure[] importedStructures =
             {
                 readStructure
             };
@@ -216,7 +216,7 @@
 
             var structureToUpdateFrom = new TestStabilityPointStructure(commonId, "new name");
             var addedStructure = new TestStabilityPointStructure("added id");
-            var importedStructures = new[]
+            TestStabilityPointStructure[] importedStructures =
             {
                 structureToUpdateFrom,
                 addedStructure
@@ -696,11 +696,14 @@
                 removedStructure
             }, sourceFilePath);
 
-            failureMechanism.AddSectionResult(FailureMechanismSectionTestFactory.CreateFailureMechanismSection(new[]
+            failureMechanism.AddSections(new[]
             {
-                originalMatchingPoint,
-                new Point2D(10, 10)
-            }));
+                FailureMechanismSectionTestFactory.CreateFailureMechanismSection(new[]
+                {
+                    originalMatchingPoint,
+                    new Point2D(10, 10)
+                })
+            });
 
             StabilityPointStructuresHelper.UpdateCalculationToSectionResultAssignments(failureMechanism);
             StabilityPointStructuresFailureMechanismSectionResult[] sectionResults = failureMechanism.SectionResults.ToArray();
Index: Ringtoets/StabilityPointStructures/test/Ringtoets.StabilityPointStructures.Service.Test/StabilityPointStructuresDataSynchronizationServiceTest.cs
===================================================================
diff -u -r8ba37153259674b9368d4cd2297a54843b181d75 -rcf98e706be0f7385dcf2082da2fe615e7c66f44e
--- Ringtoets/StabilityPointStructures/test/Ringtoets.StabilityPointStructures.Service.Test/StabilityPointStructuresDataSynchronizationServiceTest.cs	(.../StabilityPointStructuresDataSynchronizationServiceTest.cs)	(revision 8ba37153259674b9368d4cd2297a54843b181d75)
+++ Ringtoets/StabilityPointStructures/test/Ringtoets.StabilityPointStructures.Service.Test/StabilityPointStructuresDataSynchronizationServiceTest.cs	(.../StabilityPointStructuresDataSynchronizationServiceTest.cs)	(revision cf98e706be0f7385dcf2082da2fe615e7c66f44e)
@@ -102,19 +102,23 @@
                 calculationWithStructureAAndOutput
             });
 
-            failureMechanism.AddSectionResult(FailureMechanismSectionTestFactory.CreateFailureMechanismSection(new[]
+            failureMechanism.AddSections(new[]
             {
-                locationStructureA,
-                new Point2D(1, 1)
-            }));
+                FailureMechanismSectionTestFactory.CreateFailureMechanismSection(new[]
+                {
+                    locationStructureA,
+                    new Point2D(1, 1)
+                }),
+                FailureMechanismSectionTestFactory.CreateFailureMechanismSection(new[]
+                {
+                    new Point2D(1, 1),
+                    locationStructureB
+                })
+            });
+
             StabilityPointStructuresFailureMechanismSectionResult sectionWithCalculationAtStructureA = failureMechanism.SectionResults.ElementAt(0);
             sectionWithCalculationAtStructureA.Calculation = calculationWithStructureA;
 
-            failureMechanism.AddSectionResult(FailureMechanismSectionTestFactory.CreateFailureMechanismSection(new[]
-            {
-                new Point2D(1, 1),
-                locationStructureB
-            }));
             StabilityPointStructuresFailureMechanismSectionResult sectionWithCalculationAtStructureB = failureMechanism.SectionResults.ElementAt(1);
             sectionWithCalculationAtStructureB.Calculation = calculationWithStructureBAndOutput;
 
Index: Ringtoets/Storage/test/Ringtoets.Storage.Core.Test/Create/MacroStabilityInwards/MacroStabilityInwardsFailureMechanismCreateExtensionsTest.cs
===================================================================
diff -u -rb7c9234daf5a52422362a7cb3fa1f46a86df63bb -rcf98e706be0f7385dcf2082da2fe615e7c66f44e
--- Ringtoets/Storage/test/Ringtoets.Storage.Core.Test/Create/MacroStabilityInwards/MacroStabilityInwardsFailureMechanismCreateExtensionsTest.cs	(.../MacroStabilityInwardsFailureMechanismCreateExtensionsTest.cs)	(revision b7c9234daf5a52422362a7cb3fa1f46a86df63bb)
+++ Ringtoets/Storage/test/Ringtoets.Storage.Core.Test/Create/MacroStabilityInwards/MacroStabilityInwardsFailureMechanismCreateExtensionsTest.cs	(.../MacroStabilityInwardsFailureMechanismCreateExtensionsTest.cs)	(revision cf98e706be0f7385dcf2082da2fe615e7c66f44e)
@@ -25,6 +25,7 @@
 using Core.Common.TestUtil;
 using NUnit.Framework;
 using Ringtoets.Common.Data.Calculation;
+using Ringtoets.Common.Data.FailureMechanism;
 using Ringtoets.Common.Data.TestUtil;
 using Ringtoets.MacroStabilityInwards.Data;
 using Ringtoets.MacroStabilityInwards.Data.SoilProfile;
@@ -239,8 +240,11 @@
         {
             // Setup
             var failureMechanism = new MacroStabilityInwardsFailureMechanism();
-            var testFailureMechanismSection = FailureMechanismSectionTestFactory.CreateFailureMechanismSection();
-            failureMechanism.AddSectionResult(testFailureMechanismSection);
+            FailureMechanismSection testFailureMechanismSection = FailureMechanismSectionTestFactory.CreateFailureMechanismSection();
+            failureMechanism.AddSections(new[]
+            {
+                testFailureMechanismSection
+            });
 
             // Call
             FailureMechanismEntity entity = failureMechanism.Create(new PersistenceRegistry());
Index: Ringtoets/Storage/test/Ringtoets.Storage.Core.TestUtil/RingtoetsProjectTestHelper.cs
===================================================================
diff -u -r2d41276aeba8f80eb646aee2a6812dddc4110c56 -rcf98e706be0f7385dcf2082da2fe615e7c66f44e
--- Ringtoets/Storage/test/Ringtoets.Storage.Core.TestUtil/RingtoetsProjectTestHelper.cs	(.../RingtoetsProjectTestHelper.cs)	(revision 2d41276aeba8f80eb646aee2a6812dddc4110c56)
+++ Ringtoets/Storage/test/Ringtoets.Storage.Core.TestUtil/RingtoetsProjectTestHelper.cs	(.../RingtoetsProjectTestHelper.cs)	(revision cf98e706be0f7385dcf2082da2fe615e7c66f44e)
@@ -306,21 +306,24 @@
 
         private static void AddSections(IFailureMechanism failureMechanism)
         {
-            failureMechanism.AddSection(new FailureMechanismSection("section 1", new[]
+            failureMechanism.AddSections(new[]
             {
-                new Point2D(0, 2),
-                new Point2D(2, 3)
-            }));
-            failureMechanism.AddSection(new FailureMechanismSection("section 2", new[]
-            {
-                new Point2D(2, 3),
-                new Point2D(4, 5)
-            }));
-            failureMechanism.AddSection(new FailureMechanismSection("section 3", new[]
-            {
-                new Point2D(4, 5),
-                new Point2D(2, 3)
-            }));
+                new FailureMechanismSection("section 1", new[]
+                {
+                    new Point2D(0, 2),
+                    new Point2D(2, 3)
+                }),
+                new FailureMechanismSection("section 2", new[]
+                {
+                    new Point2D(2, 3),
+                    new Point2D(4, 5)
+                }),
+                new FailureMechanismSection("section 3", new[]
+                {
+                    new Point2D(4, 5),
+                    new Point2D(2, 3)
+                })
+            });
         }
 
         private static void AddForeshoreProfiles(ForeshoreProfileCollection foreshoreProfiles)