Index: Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Plugin/GrassCoverErosionOutwardsPlugin.cs
===================================================================
diff -u -rb7a286a62693f3a071c55ced2a7cdc4d6a577cfe -r18ff00ec64534e2a0f3ad728363660b4fd93b149
--- Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Plugin/GrassCoverErosionOutwardsPlugin.cs	(.../GrassCoverErosionOutwardsPlugin.cs)	(revision b7a286a62693f3a071c55ced2a7cdc4d6a577cfe)
+++ Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Plugin/GrassCoverErosionOutwardsPlugin.cs	(.../GrassCoverErosionOutwardsPlugin.cs)	(revision 18ff00ec64534e2a0f3ad728363660b4fd93b149)
@@ -799,8 +799,9 @@
             foreach (GrassCoverErosionOutwardsWaveConditionsCalculation calculation in calculations)
             {
                 GrassCoverErosionOutwardsWaveConditionsCalculationService.Validate(calculation,
-                                                                                   failureMechanism.GetNormativeAssessmentLevel(assessmentSection,
-                                                                                                                                calculation.InputParameters.HydraulicBoundaryLocation),
+                                                                                   failureMechanism.GetAssessmentLevel(assessmentSection,
+                                                                                                                       calculation.InputParameters.HydraulicBoundaryLocation,
+                                                                                                                       calculation.InputParameters.CategoryType),
                                                                                    assessmentSection.HydraulicBoundaryDatabase.FilePath,
                                                                                    assessmentSection.HydraulicBoundaryDatabase.EffectivePreprocessorDirectory());
             }
@@ -940,8 +941,9 @@
         private static void Validate(GrassCoverErosionOutwardsWaveConditionsCalculationContext context)
         {
             GrassCoverErosionOutwardsWaveConditionsCalculationService.Validate(context.WrappedData,
-                                                                               context.FailureMechanism.GetNormativeAssessmentLevel(context.AssessmentSection,
-                                                                                                                                    context.WrappedData.InputParameters.HydraulicBoundaryLocation),
+                                                                               context.FailureMechanism.GetAssessmentLevel(context.AssessmentSection,
+                                                                                                                           context.WrappedData.InputParameters.HydraulicBoundaryLocation,
+                                                                                                                           context.WrappedData.InputParameters.CategoryType),
                                                                                context.AssessmentSection.HydraulicBoundaryDatabase.FilePath,
                                                                                context.AssessmentSection.HydraulicBoundaryDatabase.EffectivePreprocessorDirectory());
         }
Index: Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Service/GrassCoverErosionOutwardsWaveConditionsCalculationActivity.cs
===================================================================
diff -u -ra7c351a2f6cb6ab18a30d248a60cbf34abe47ad7 -r18ff00ec64534e2a0f3ad728363660b4fd93b149
--- Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Service/GrassCoverErosionOutwardsWaveConditionsCalculationActivity.cs	(.../GrassCoverErosionOutwardsWaveConditionsCalculationActivity.cs)	(revision a7c351a2f6cb6ab18a30d248a60cbf34abe47ad7)
+++ Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Service/GrassCoverErosionOutwardsWaveConditionsCalculationActivity.cs	(.../GrassCoverErosionOutwardsWaveConditionsCalculationActivity.cs)	(revision 18ff00ec64534e2a0f3ad728363660b4fd93b149)
@@ -20,7 +20,6 @@
 // All rights reserved.
 
 using System;
-using Core.Common.Base.Data;
 using Core.Common.Base.Service;
 using Ringtoets.Common.Data.AssessmentSection;
 using Ringtoets.Common.Data.Hydraulics;
@@ -58,14 +57,17 @@
             {
                 throw new ArgumentNullException(nameof(calculation));
             }
+
             if (hlcdFilePath == null)
             {
                 throw new ArgumentNullException(nameof(hlcdFilePath));
             }
+
             if (failureMechanism == null)
             {
                 throw new ArgumentNullException(nameof(failureMechanism));
             }
+
             if (assessmentSection == null)
             {
                 throw new ArgumentNullException(nameof(assessmentSection));
@@ -84,7 +86,9 @@
         protected override bool Validate()
         {
             return GrassCoverErosionOutwardsWaveConditionsCalculationService.Validate(calculation,
-                                                                                      failureMechanism.GetNormativeAssessmentLevel(assessmentSection, calculation.InputParameters.HydraulicBoundaryLocation),
+                                                                                      failureMechanism.GetAssessmentLevel(assessmentSection,
+                                                                                                                          calculation.InputParameters.HydraulicBoundaryLocation,
+                                                                                                                          calculation.InputParameters.CategoryType),
                                                                                       hlcdFilePath,
                                                                                       assessmentSection.HydraulicBoundaryDatabase.EffectivePreprocessorDirectory());
         }
Index: Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Service/GrassCoverErosionOutwardsWaveConditionsCalculationService.cs
===================================================================
diff -u -r376859993eadc6d75eea3e97d624b83a24e922b6 -r18ff00ec64534e2a0f3ad728363660b4fd93b149
--- Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Service/GrassCoverErosionOutwardsWaveConditionsCalculationService.cs	(.../GrassCoverErosionOutwardsWaveConditionsCalculationService.cs)	(revision 376859993eadc6d75eea3e97d624b83a24e922b6)
+++ Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Service/GrassCoverErosionOutwardsWaveConditionsCalculationService.cs	(.../GrassCoverErosionOutwardsWaveConditionsCalculationService.cs)	(revision 18ff00ec64534e2a0f3ad728363660b4fd93b149)
@@ -44,13 +44,13 @@
         /// Performs validation over the input parameters. Error and status information is logged during the execution of the operation.
         /// </summary>
         /// <param name="calculation">The <see cref="GrassCoverErosionOutwardsWaveConditionsCalculation"/> for which to validate the values.</param>
-        /// <param name="normativeAssessmentLevel">The normative assessment level to use for determining water levels.</param>
+        /// <param name="assessmentLevel">The assessment level to use for determining water levels.</param>
         /// <param name="hydraulicBoundaryDatabaseFilePath">The file path of the hydraulic boundary database file which to validate.</param>
         /// <param name="preprocessorDirectory">The preprocessor directory to validate.</param>
         /// <returns><c>true</c> if there were no validation errors; <c>false</c> otherwise.</returns>
         /// <exception cref="ArgumentNullException">Thrown when <paramref name="calculation"/> is <c>null</c>.</exception>
         public static bool Validate(GrassCoverErosionOutwardsWaveConditionsCalculation calculation,
-                                    RoundedDouble normativeAssessmentLevel,
+                                    RoundedDouble assessmentLevel,
                                     string hydraulicBoundaryDatabaseFilePath,
                                     string preprocessorDirectory)
         {
@@ -60,7 +60,7 @@
             }
 
             return ValidateWaveConditionsInput(calculation.InputParameters,
-                                               normativeAssessmentLevel,
+                                               assessmentLevel,
                                                hydraulicBoundaryDatabaseFilePath,
                                                preprocessorDirectory,
                                                Resources.GrassCoverErosionOutwardsWaveConditionsCalculationService_LogMessage_DesignWaterLevel_name);
Index: Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Plugin.Test/TreeNodeInfos/GrassCoverErosionOutwardsWaveConditionsCalculationContextTreeNodeInfoTest.cs
===================================================================
diff -u -r376859993eadc6d75eea3e97d624b83a24e922b6 -r18ff00ec64534e2a0f3ad728363660b4fd93b149
--- Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Plugin.Test/TreeNodeInfos/GrassCoverErosionOutwardsWaveConditionsCalculationContextTreeNodeInfoTest.cs	(.../GrassCoverErosionOutwardsWaveConditionsCalculationContextTreeNodeInfoTest.cs)	(revision 376859993eadc6d75eea3e97d624b83a24e922b6)
+++ Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Plugin.Test/TreeNodeInfos/GrassCoverErosionOutwardsWaveConditionsCalculationContextTreeNodeInfoTest.cs	(.../GrassCoverErosionOutwardsWaveConditionsCalculationContextTreeNodeInfoTest.cs)	(revision 18ff00ec64534e2a0f3ad728363660b4fd93b149)
@@ -1062,6 +1062,7 @@
             if (validCalculation)
             {
                 calculation.InputParameters.HydraulicBoundaryLocation = assessmentSection.HydraulicBoundaryDatabase.Locations.First();
+                calculation.InputParameters.CategoryType = FailureMechanismCategoryType.MechanismSpecificLowerLimitNorm;
                 calculation.InputParameters.LowerBoundaryRevetment = (RoundedDouble) 1.0;
                 calculation.InputParameters.UpperBoundaryRevetment = (RoundedDouble) 10.0;
                 calculation.InputParameters.StepSize = WaveConditionsInputStepSize.One;
@@ -1143,6 +1144,7 @@
                 InputParameters =
                 {
                     HydraulicBoundaryLocation = assessmentSection.HydraulicBoundaryDatabase.Locations.First(),
+                    CategoryType = FailureMechanismCategoryType.MechanismSpecificLowerLimitNorm,
                     LowerBoundaryRevetment = (RoundedDouble) 1.0,
                     UpperBoundaryRevetment = (RoundedDouble) 10.0,
                     StepSize = WaveConditionsInputStepSize.One,
@@ -1222,6 +1224,7 @@
                 InputParameters =
                 {
                     HydraulicBoundaryLocation = assessmentSection.HydraulicBoundaryDatabase.Locations.First(),
+                    CategoryType = FailureMechanismCategoryType.MechanismSpecificLowerLimitNorm,
                     LowerBoundaryRevetment = (RoundedDouble) 1.0,
                     UpperBoundaryRevetment = (RoundedDouble) 10.0,
                     StepSize = WaveConditionsInputStepSize.One,
@@ -1301,6 +1304,7 @@
                 InputParameters =
                 {
                     HydraulicBoundaryLocation = assessmentSection.HydraulicBoundaryDatabase.Locations.First(),
+                    CategoryType = FailureMechanismCategoryType.MechanismSpecificLowerLimitNorm,
                     LowerBoundaryRevetment = (RoundedDouble) 1.0,
                     UpperBoundaryRevetment = (RoundedDouble) 10.0,
                     StepSize = WaveConditionsInputStepSize.One,
Index: Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Plugin.Test/TreeNodeInfos/GrassCoverErosionOutwardsWaveConditionsCalculationGroupContextTreeNodeInfoTest.cs
===================================================================
diff -u -r376859993eadc6d75eea3e97d624b83a24e922b6 -r18ff00ec64534e2a0f3ad728363660b4fd93b149
--- Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Plugin.Test/TreeNodeInfos/GrassCoverErosionOutwardsWaveConditionsCalculationGroupContextTreeNodeInfoTest.cs	(.../GrassCoverErosionOutwardsWaveConditionsCalculationGroupContextTreeNodeInfoTest.cs)	(revision 376859993eadc6d75eea3e97d624b83a24e922b6)
+++ Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Plugin.Test/TreeNodeInfos/GrassCoverErosionOutwardsWaveConditionsCalculationGroupContextTreeNodeInfoTest.cs	(.../GrassCoverErosionOutwardsWaveConditionsCalculationGroupContextTreeNodeInfoTest.cs)	(revision 18ff00ec64534e2a0f3ad728363660b4fd93b149)
@@ -914,6 +914,7 @@
                 InputParameters =
                 {
                     HydraulicBoundaryLocation = assessmentSection.HydraulicBoundaryDatabase.Locations.First(),
+                    CategoryType = FailureMechanismCategoryType.MechanismSpecificLowerLimitNorm,
                     LowerBoundaryRevetment = (RoundedDouble) 1.0,
                     UpperBoundaryRevetment = (RoundedDouble) 10.0,
                     StepSize = WaveConditionsInputStepSize.One,
@@ -928,6 +929,7 @@
                 InputParameters =
                 {
                     HydraulicBoundaryLocation = assessmentSection.HydraulicBoundaryDatabase.Locations.First(),
+                    CategoryType = FailureMechanismCategoryType.MechanismSpecificLowerLimitNorm,
                     LowerBoundaryRevetment = (RoundedDouble) 1.0,
                     UpperBoundaryRevetment = (RoundedDouble) 10.0,
                     StepSize = WaveConditionsInputStepSize.One,
@@ -999,6 +1001,7 @@
                 InputParameters =
                 {
                     HydraulicBoundaryLocation = assessmentSection.HydraulicBoundaryDatabase.Locations.First(),
+                    CategoryType = FailureMechanismCategoryType.MechanismSpecificLowerLimitNorm,
                     LowerBoundaryRevetment = (RoundedDouble) 1.0,
                     UpperBoundaryRevetment = (RoundedDouble) 10.0,
                     StepSize = WaveConditionsInputStepSize.One,
@@ -1067,6 +1070,7 @@
                 InputParameters =
                 {
                     HydraulicBoundaryLocation = assessmentSection.HydraulicBoundaryDatabase.Locations.First(),
+                    CategoryType = FailureMechanismCategoryType.MechanismSpecificLowerLimitNorm,
                     LowerBoundaryRevetment = (RoundedDouble) 1.0,
                     UpperBoundaryRevetment = (RoundedDouble) 10.0,
                     StepSize = WaveConditionsInputStepSize.One,
@@ -1139,6 +1143,7 @@
                 InputParameters =
                 {
                     HydraulicBoundaryLocation = assessmentSection.HydraulicBoundaryDatabase.Locations.First(),
+                    CategoryType = FailureMechanismCategoryType.MechanismSpecificLowerLimitNorm,
                     LowerBoundaryRevetment = (RoundedDouble) 1.0,
                     UpperBoundaryRevetment = (RoundedDouble) 10.0,
                     StepSize = WaveConditionsInputStepSize.One,
Index: Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Service.Test/GrassCoverErosionOutwardsWaveConditionsCalculationServiceTest.cs
===================================================================
diff -u -r376859993eadc6d75eea3e97d624b83a24e922b6 -r18ff00ec64534e2a0f3ad728363660b4fd93b149
--- Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Service.Test/GrassCoverErosionOutwardsWaveConditionsCalculationServiceTest.cs	(.../GrassCoverErosionOutwardsWaveConditionsCalculationServiceTest.cs)	(revision 376859993eadc6d75eea3e97d624b83a24e922b6)
+++ Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Service.Test/GrassCoverErosionOutwardsWaveConditionsCalculationServiceTest.cs	(.../GrassCoverErosionOutwardsWaveConditionsCalculationServiceTest.cs)	(revision 18ff00ec64534e2a0f3ad728363660b4fd93b149)
@@ -70,7 +70,7 @@
         {
             // Call
             TestDelegate test = () => GrassCoverErosionOutwardsWaveConditionsCalculationService.Validate(null,
-                                                                                                         GetValidNormativeAssessmentLevel(),
+                                                                                                         GetValidAssessmentLevel(),
                                                                                                          validFilePath,
                                                                                                          validPreprocessorDirectory);
 
@@ -96,7 +96,7 @@
             {
                 // Call
                 Action call = () => isValid = GrassCoverErosionOutwardsWaveConditionsCalculationService.Validate(calculation,
-                                                                                                                 GetValidNormativeAssessmentLevel(),
+                                                                                                                 GetValidAssessmentLevel(),
                                                                                                                  testFilePath,
                                                                                                                  validPreprocessorDirectory);
 
@@ -132,7 +132,7 @@
             {
                 // Call
                 Action call = () => isValid = GrassCoverErosionOutwardsWaveConditionsCalculationService.Validate(calculation,
-                                                                                                                 GetValidNormativeAssessmentLevel(),
+                                                                                                                 GetValidAssessmentLevel(),
                                                                                                                  invalidFilePath,
                                                                                                                  validPreprocessorDirectory);
 
@@ -168,7 +168,7 @@
             {
                 // Call
                 Action call = () => isValid = GrassCoverErosionOutwardsWaveConditionsCalculationService.Validate(calculation,
-                                                                                                                 GetValidNormativeAssessmentLevel(),
+                                                                                                                 GetValidAssessmentLevel(),
                                                                                                                  validFilePath,
                                                                                                                  invalidPreprocessorDirectory);
 
@@ -204,7 +204,7 @@
             {
                 // Call
                 Action call = () => isValid = GrassCoverErosionOutwardsWaveConditionsCalculationService.Validate(calculation,
-                                                                                                                 GetValidNormativeAssessmentLevel(),
+                                                                                                                 GetValidAssessmentLevel(),
                                                                                                                  testFilePath,
                                                                                                                  validPreprocessorDirectory);
 
@@ -240,7 +240,7 @@
             {
                 // Call
                 Action call = () => isValid = GrassCoverErosionOutwardsWaveConditionsCalculationService.Validate(calculation,
-                                                                                                                 GetValidNormativeAssessmentLevel(),
+                                                                                                                 GetValidAssessmentLevel(),
                                                                                                                  validFilePath,
                                                                                                                  validPreprocessorDirectory);
 
@@ -260,7 +260,7 @@
         }
 
         [Test]
-        public void Validate_NormativeAssessmentLevelNaN_LogsValidationMessageAndReturnFalse()
+        public void Validate_AssessmentLevelNaN_LogsValidationMessageAndReturnFalse()
         {
             // Setup
             var mockRepository = new MockRepository();
@@ -314,7 +314,7 @@
             {
                 // Call
                 Action call = () => isValid = GrassCoverErosionOutwardsWaveConditionsCalculationService.Validate(calculation,
-                                                                                                                 GetValidNormativeAssessmentLevel(),
+                                                                                                                 GetValidAssessmentLevel(),
                                                                                                                  validFilePath,
                                                                                                                  validPreprocessorDirectory);
 
@@ -355,7 +355,7 @@
             {
                 // Call
                 Action call = () => isValid = GrassCoverErosionOutwardsWaveConditionsCalculationService.Validate(calculation,
-                                                                                                                 GetValidNormativeAssessmentLevel(),
+                                                                                                                 GetValidAssessmentLevel(),
                                                                                                                  validFilePath,
                                                                                                                  validPreprocessorDirectory);
 
@@ -1099,7 +1099,7 @@
             return calculation;
         }
 
-        private static RoundedDouble GetValidNormativeAssessmentLevel()
+        private static RoundedDouble GetValidAssessmentLevel()
         {
             return (RoundedDouble) 9.3;
         }