Index: Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Data/GrassCoverErosionOutwardsFailureMechanismExtensions.cs
===================================================================
diff -u -r5a19c1544d732696d84f24877303cdfb19122bc7 -r230a4c55f64ec075d4685b046d7e95e4b3e84e25
--- Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Data/GrassCoverErosionOutwardsFailureMechanismExtensions.cs	(.../GrassCoverErosionOutwardsFailureMechanismExtensions.cs)	(revision 5a19c1544d732696d84f24877303cdfb19122bc7)
+++ Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Data/GrassCoverErosionOutwardsFailureMechanismExtensions.cs	(.../GrassCoverErosionOutwardsFailureMechanismExtensions.cs)	(revision 230a4c55f64ec075d4685b046d7e95e4b3e84e25)
@@ -58,12 +58,12 @@
         /// <summary>
         /// Gets the norm which is needed in the calculations within <see cref="GrassCoverErosionOutwardsFailureMechanism"/>.
         /// </summary>
-        /// <param name="failureMechanism">The <see cref="GrassCoverErosionOutwardsFailureMechanism"/> to get the failure mechanism norm for.</param>
-        /// <param name="assessmentSection">The <see cref="IAssessmentSection"/> which contains the assessment section norm.</param>
-        /// <returns>The value of the failure mechanism norm.</returns>
+        /// <param name="failureMechanism">The <see cref="GrassCoverErosionOutwardsFailureMechanism"/> to get the failure mechanism return period for.</param>
+        /// <param name="assessmentSection">The <see cref="IAssessmentSection"/> which contains the assessment section return period.</param>
+        /// <returns>The value of the failure mechanism return period.</returns>
         /// <exception cref="ArgumentNullException">Thrown when <paramref name="assessmentSection"/> is <c>null</c>.</exception>
         /// <exception cref="ArgumentException">Thrown when <paramref name="failureMechanism"/> has no (0) contribution.</exception>
-        public static double GetMechanismSpecificNorm(this GrassCoverErosionOutwardsFailureMechanism failureMechanism, IAssessmentSection assessmentSection)
+        public static double GetMechanismSpecificReturnPeriod(this GrassCoverErosionOutwardsFailureMechanism failureMechanism, IAssessmentSection assessmentSection)
         {
             if (assessmentSection == null)
             {
Index: Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Forms/Views/GrassCoverErosionOutwardsDesignWaterLevelLocationsView.cs
===================================================================
diff -u -r5a19c1544d732696d84f24877303cdfb19122bc7 -r230a4c55f64ec075d4685b046d7e95e4b3e84e25
--- Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Forms/Views/GrassCoverErosionOutwardsDesignWaterLevelLocationsView.cs	(.../GrassCoverErosionOutwardsDesignWaterLevelLocationsView.cs)	(revision 5a19c1544d732696d84f24877303cdfb19122bc7)
+++ Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Forms/Views/GrassCoverErosionOutwardsDesignWaterLevelLocationsView.cs	(.../GrassCoverErosionOutwardsDesignWaterLevelLocationsView.cs)	(revision 230a4c55f64ec075d4685b046d7e95e4b3e84e25)
@@ -94,14 +94,14 @@
                 return;
             }
 
-            var mechanismSpecificNorm = GetMechanismSpecificNorm();
+            var mechanismSpecificReturnPeriod = GetMechanismSpecificReturnPeriod();
 
-            if (!double.IsNaN(mechanismSpecificNorm))
+            if (!double.IsNaN(mechanismSpecificReturnPeriod))
             {
                 bool successfulCalculation = CalculationGuiService.CalculateDesignWaterLevels(AssessmentSection.HydraulicBoundaryDatabase.FilePath,
                                                                                               locations,
                                                                                               AssessmentSection.Id,
-                                                                                              mechanismSpecificNorm,
+                                                                                              mechanismSpecificReturnPeriod,
                                                                                               new GrassCoverErosionOutwardsDesignWaterLevelCalculationMessageProvider());
                 if (successfulCalculation)
                 {
@@ -141,18 +141,18 @@
             return false;
         }
 
-        private double GetMechanismSpecificNorm()
+        private double GetMechanismSpecificReturnPeriod()
         {
-            var mechanismSpecificNorm = double.NaN;
+            var mechanismSpecificReturnPeriod = double.NaN;
             try
             {
-                mechanismSpecificNorm = FailureMechanism.GetMechanismSpecificNorm(AssessmentSection);
+                mechanismSpecificReturnPeriod = FailureMechanism.GetMechanismSpecificReturnPeriod(AssessmentSection);
             }
             catch (ArgumentException e)
             {
                 log.ErrorFormat(e.Message);
             }
-            return mechanismSpecificNorm;
+            return mechanismSpecificReturnPeriod;
         }
     }
 }
\ No newline at end of file
Index: Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Forms/Views/GrassCoverErosionOutwardsWaveHeightLocationsView.cs
===================================================================
diff -u -r5a19c1544d732696d84f24877303cdfb19122bc7 -r230a4c55f64ec075d4685b046d7e95e4b3e84e25
--- Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Forms/Views/GrassCoverErosionOutwardsWaveHeightLocationsView.cs	(.../GrassCoverErosionOutwardsWaveHeightLocationsView.cs)	(revision 5a19c1544d732696d84f24877303cdfb19122bc7)
+++ Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Forms/Views/GrassCoverErosionOutwardsWaveHeightLocationsView.cs	(.../GrassCoverErosionOutwardsWaveHeightLocationsView.cs)	(revision 230a4c55f64ec075d4685b046d7e95e4b3e84e25)
@@ -94,14 +94,14 @@
                 return;
             }
 
-            var mechanismSpecificNorm = GetMechanismSpecificNorm();
+            var mechanismSpecificReturnPeriod = GetMechanismSpecificReturnPeriod();
 
-            if (!double.IsNaN(mechanismSpecificNorm))
+            if (!double.IsNaN(mechanismSpecificReturnPeriod))
             {
                 bool successFullCalculation = CalculationGuiService.CalculateWaveHeights(AssessmentSection.HydraulicBoundaryDatabase.FilePath,
                                                                                          locations,
                                                                                          AssessmentSection.Id,
-                                                                                         mechanismSpecificNorm,
+                                                                                         mechanismSpecificReturnPeriod,
                                                                                          new GrassCoverErosionOutwardsWaveHeightCalculationMessageProvider());
 
                 if (successFullCalculation)
@@ -155,18 +155,18 @@
             return false;
         }
 
-        private double GetMechanismSpecificNorm()
+        private double GetMechanismSpecificReturnPeriod()
         {
-            var mechanismSpecificNorm = double.NaN;
+            var mechanismSpecificReturnPeriod = double.NaN;
             try
             {
-                mechanismSpecificNorm = FailureMechanism.GetMechanismSpecificNorm(AssessmentSection);
+                mechanismSpecificReturnPeriod = FailureMechanism.GetMechanismSpecificReturnPeriod(AssessmentSection);
             }
             catch (ArgumentException e)
             {
                 log.ErrorFormat(e.Message);
             }
-            return mechanismSpecificNorm;
+            return mechanismSpecificReturnPeriod;
         }
     }
 }
\ No newline at end of file
Index: Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Plugin/GrassCoverErosionOutwardsPlugin.cs
===================================================================
diff -u -r54fd939cf2a3d8f718dad28faa24373334d4cc2e -r230a4c55f64ec075d4685b046d7e95e4b3e84e25
--- Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Plugin/GrassCoverErosionOutwardsPlugin.cs	(.../GrassCoverErosionOutwardsPlugin.cs)	(revision 54fd939cf2a3d8f718dad28faa24373334d4cc2e)
+++ Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Plugin/GrassCoverErosionOutwardsPlugin.cs	(.../GrassCoverErosionOutwardsPlugin.cs)	(revision 230a4c55f64ec075d4685b046d7e95e4b3e84e25)
@@ -502,15 +502,15 @@
                     IAssessmentSection assessmentSection = nodeData.AssessmentSection;
                     GrassCoverErosionOutwardsFailureMechanism failureMechanism = nodeData.FailureMechanism;
 
-                    var mechanismSpecificNorm = GetMechanismSpecificNorm(failureMechanism, assessmentSection);
+                    var mechanismSpecificReturnPeriod = GetMechanismSpecificReturnPeriod(failureMechanism, assessmentSection);
 
-                    if (!double.IsNaN(mechanismSpecificNorm))
+                    if (!double.IsNaN(mechanismSpecificReturnPeriod))
                     {
                         bool successfulCalculation = hydraulicBoundaryLocationCalculationGuiService.CalculateDesignWaterLevels(
                             assessmentSection.HydraulicBoundaryDatabase.FilePath,
                             nodeData.WrappedData,
                             assessmentSection.Id,
-                            mechanismSpecificNorm,
+                            mechanismSpecificReturnPeriod,
                             new GrassCoverErosionOutwardsDesignWaterLevelCalculationMessageProvider());
 
                         if (successfulCalculation)
@@ -560,15 +560,15 @@
                         return;
                     }
 
-                    var mechanismSpecificNorm = GetMechanismSpecificNorm(failureMechanism, assessmentSection);
+                    var mechanismSpecificReturnPeriod = GetMechanismSpecificReturnPeriod(failureMechanism, assessmentSection);
 
-                    if (!double.IsNaN(mechanismSpecificNorm))
+                    if (!double.IsNaN(mechanismSpecificReturnPeriod))
                     {
                         bool successfulCalculation = hydraulicBoundaryLocationCalculationGuiService.CalculateWaveHeights(
                             assessmentSection.HydraulicBoundaryDatabase.FilePath,
                             nodeData.WrappedData,
                             assessmentSection.Id,
-                            mechanismSpecificNorm,
+                            mechanismSpecificReturnPeriod,
                             new GrassCoverErosionOutwardsWaveHeightCalculationMessageProvider());
 
                         if (successfulCalculation)
@@ -875,18 +875,18 @@
 
         #endregion
 
-        private static double GetMechanismSpecificNorm(GrassCoverErosionOutwardsFailureMechanism failureMechanism, IAssessmentSection assessmentSection)
+        private static double GetMechanismSpecificReturnPeriod(GrassCoverErosionOutwardsFailureMechanism failureMechanism, IAssessmentSection assessmentSection)
         {
-            var mechanismSpecificNorm = double.NaN;
+            var mechanismSpecificReturnPeriod = double.NaN;
             try
             {
-                mechanismSpecificNorm = failureMechanism.GetMechanismSpecificNorm(assessmentSection);
+                mechanismSpecificReturnPeriod = failureMechanism.GetMechanismSpecificReturnPeriod(assessmentSection);
             }
             catch (ArgumentException e)
             {
                 log.ErrorFormat(e.Message);
             }
-            return mechanismSpecificNorm;
+            return mechanismSpecificReturnPeriod;
         }
 
         #endregion
Index: Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Service/GrassCoverErosionOutwardsWaveConditionsCalculationService.cs
===================================================================
diff -u -rcd7078972189cf51d899754097ef3cbc0ddc26ee -r230a4c55f64ec075d4685b046d7e95e4b3e84e25
--- Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Service/GrassCoverErosionOutwardsWaveConditionsCalculationService.cs	(.../GrassCoverErosionOutwardsWaveConditionsCalculationService.cs)	(revision cd7078972189cf51d899754097ef3cbc0ddc26ee)
+++ Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Service/GrassCoverErosionOutwardsWaveConditionsCalculationService.cs	(.../GrassCoverErosionOutwardsWaveConditionsCalculationService.cs)	(revision 230a4c55f64ec075d4685b046d7e95e4b3e84e25)
@@ -78,7 +78,7 @@
             var b = failureMechanism.GeneralInput.GeneralWaveConditionsInput.B;
             var c = failureMechanism.GeneralInput.GeneralWaveConditionsInput.C;
             var ringId = assessmentSection.Id;
-            var mechanismSpecificReturnPeriod = failureMechanism.GetMechanismSpecificNorm(assessmentSection);
+            var mechanismSpecificReturnPeriod = failureMechanism.GetMechanismSpecificReturnPeriod(assessmentSection);
             TotalWaterLevelCalculations = calculation.InputParameters.WaterLevels.Count();
 
             try
Index: Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Data.Test/GrassCoverErosionOutwardsFailureMechanismExtensionsTest.cs
===================================================================
diff -u -r5a19c1544d732696d84f24877303cdfb19122bc7 -r230a4c55f64ec075d4685b046d7e95e4b3e84e25
--- Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Data.Test/GrassCoverErosionOutwardsFailureMechanismExtensionsTest.cs	(.../GrassCoverErosionOutwardsFailureMechanismExtensionsTest.cs)	(revision 5a19c1544d732696d84f24877303cdfb19122bc7)
+++ Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Data.Test/GrassCoverErosionOutwardsFailureMechanismExtensionsTest.cs	(.../GrassCoverErosionOutwardsFailureMechanismExtensionsTest.cs)	(revision 230a4c55f64ec075d4685b046d7e95e4b3e84e25)
@@ -87,21 +87,21 @@
         }
 
         [Test]
-        public void GetMechanismSpecificNorm_AssessmentSectionNull_ThrowsArgumentNullException()
+        public void GetMechanismSpecificReturnPeriod_AssessmentSectionNull_ThrowsArgumentNullException()
         {
             // Setup
             var failureMechanism = new GrassCoverErosionOutwardsFailureMechanism();
 
             // Call
-            TestDelegate test = () => failureMechanism.GetMechanismSpecificNorm(null);
+            TestDelegate test = () => failureMechanism.GetMechanismSpecificReturnPeriod(null);
 
             // Assert
             var exception = Assert.Throws<ArgumentNullException>(test);
             Assert.AreEqual("assessmentSection", exception.ParamName);
         }
 
         [Test]
-        public void GetMechanismSpecificNorm_WithAssessmentSection_ReturnMechanismSpecificNorm()
+        public void GetMechanismSpecificReturnPeriod_WithAssessmentSection_ReturnMechanismSpecificReturnPeriod()
         {
             // Setup
             var failureMechanism = new GrassCoverErosionOutwardsFailureMechanism
@@ -122,14 +122,14 @@
             mocks.ReplayAll();
 
             // Call
-            double mechanismSpecificNorm = failureMechanism.GetMechanismSpecificNorm(assessmentSection);
+            double mechanismSpecificReturnPeriod = failureMechanism.GetMechanismSpecificReturnPeriod(assessmentSection);
 
             // Assert
-            Assert.AreEqual(6000, mechanismSpecificNorm);
+            Assert.AreEqual(6000, mechanismSpecificReturnPeriod);
         }
 
         [Test]
-        public void GetMechanismSpecificNorm_WithZeroContributionForFailureMechanism_ThrowsArgumentException()
+        public void GetMechanismSpecificReturnPeriod_WithZeroContributionForFailureMechanism_ThrowsArgumentException()
         {
             // Setup
             var failureMechanism = new GrassCoverErosionOutwardsFailureMechanism
@@ -150,7 +150,7 @@
             mocks.ReplayAll();
 
             // Call
-            TestDelegate action = () => failureMechanism.GetMechanismSpecificNorm(assessmentSection);
+            TestDelegate action = () => failureMechanism.GetMechanismSpecificReturnPeriod(assessmentSection);
 
             // Assert
             TestHelper.AssertThrowsArgumentExceptionAndTestMessage<ArgumentException>(action, "De bijdrage van dit toetsspoor is nul. Daardoor is de doorsnede-eis onbepaald en kunnen de berekeningen niet worden uitgevoerd.");
Index: Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Integration.Test/GrassCoverErosionOutwardsWaveConditionsCalculationActivityIntegrationTest.cs
===================================================================
diff -u -r2aa9661130f20e88c41dac921ffb780573dcf799 -r230a4c55f64ec075d4685b046d7e95e4b3e84e25
--- Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Integration.Test/GrassCoverErosionOutwardsWaveConditionsCalculationActivityIntegrationTest.cs	(.../GrassCoverErosionOutwardsWaveConditionsCalculationActivityIntegrationTest.cs)	(revision 2aa9661130f20e88c41dac921ffb780573dcf799)
+++ Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Integration.Test/GrassCoverErosionOutwardsWaveConditionsCalculationActivityIntegrationTest.cs	(.../GrassCoverErosionOutwardsWaveConditionsCalculationActivityIntegrationTest.cs)	(revision 230a4c55f64ec075d4685b046d7e95e4b3e84e25)
@@ -206,7 +206,7 @@
                     var expectedInput = new WaveConditionsCosineCalculationInput(1,
                                                                                  input.Orientation,
                                                                                  input.HydraulicBoundaryLocation.Id,
-                                                                                 assessmentSection.GrassCoverErosionOutwards.GetMechanismSpecificNorm(assessmentSection),
+                                                                                 assessmentSection.GrassCoverErosionOutwards.GetMechanismSpecificReturnPeriod(assessmentSection),
                                                                                  input.ForeshoreProfile.Geometry.Select(c => new HydraRingForelandPoint(c.X, c.Y)),
                                                                                  new HydraRingBreakWater((int) input.BreakWater.Type, input.BreakWater.Height),
                                                                                  calculation.InputParameters.WaterLevels.ElementAt(waterLevelIndex++),
Index: Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Service.Test/GrassCoverErosionOutwardsWaveConditionsCalculationServiceTest.cs
===================================================================
diff -u -r2aa9661130f20e88c41dac921ffb780573dcf799 -r230a4c55f64ec075d4685b046d7e95e4b3e84e25
--- Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Service.Test/GrassCoverErosionOutwardsWaveConditionsCalculationServiceTest.cs	(.../GrassCoverErosionOutwardsWaveConditionsCalculationServiceTest.cs)	(revision 2aa9661130f20e88c41dac921ffb780573dcf799)
+++ Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Service.Test/GrassCoverErosionOutwardsWaveConditionsCalculationServiceTest.cs	(.../GrassCoverErosionOutwardsWaveConditionsCalculationServiceTest.cs)	(revision 230a4c55f64ec075d4685b046d7e95e4b3e84e25)
@@ -419,7 +419,7 @@
                     var expectedInput = new WaveConditionsCosineCalculationInput(1,
                                                                                  input.Orientation,
                                                                                  input.HydraulicBoundaryLocation.Id,
-                                                                                 grassCoverErosionOutwardsFailureMechanism.GetMechanismSpecificNorm(assessmentSectionStub),
+                                                                                 grassCoverErosionOutwardsFailureMechanism.GetMechanismSpecificReturnPeriod(assessmentSectionStub),
                                                                                  input.ForeshoreProfile.Geometry.Select(c => new HydraRingForelandPoint(c.X, c.Y)),
                                                                                  new HydraRingBreakWater((int) input.BreakWater.Type, input.BreakWater.Height),
                                                                                  calculation.InputParameters.WaterLevels.ElementAt(waterLevelIndex++),