Index: Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Data/GrassCoverErosionOutwardsFailureMechanismExtensions.cs
===================================================================
diff -u -r5d0dfa9a8b6e98ede2791a93ed50d48ce6ada072 -r9e2f7186181853ea7cce697f737eeca21f82551f
--- Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Data/GrassCoverErosionOutwardsFailureMechanismExtensions.cs	(.../GrassCoverErosionOutwardsFailureMechanismExtensions.cs)	(revision 5d0dfa9a8b6e98ede2791a93ed50d48ce6ada072)
+++ Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Data/GrassCoverErosionOutwardsFailureMechanismExtensions.cs	(.../GrassCoverErosionOutwardsFailureMechanismExtensions.cs)	(revision 9e2f7186181853ea7cce697f737eeca21f82551f)
@@ -24,11 +24,10 @@
 using System.ComponentModel;
 using System.Linq;
 using Core.Common.Base.Data;
-using Ringtoets.AssemblyTool.Data;
-using Ringtoets.Common.Data.AssemblyTool;
 using Ringtoets.Common.Data.AssessmentSection;
 using Ringtoets.Common.Data.FailureMechanism;
 using Ringtoets.Common.Data.Hydraulics;
+using Ringtoets.Common.Util;
 
 namespace Ringtoets.GrassCoverErosionOutwards.Data
 {
@@ -128,44 +127,17 @@
                 throw new ArgumentNullException(nameof(failureMechanism));
             }
 
-            if (assessmentSection == null)
-            {
-                throw new ArgumentNullException(nameof(assessmentSection));
-            }
-
             if (!Enum.IsDefined(typeof(FailureMechanismCategoryType), categoryType))
             {
                 throw new InvalidEnumArgumentException(nameof(categoryType),
                                                        (int) categoryType,
                                                        typeof(FailureMechanismCategoryType));
             }
 
-            IEnumerable<FailureMechanismSectionAssemblyCategory> categories = AssemblyToolCategoriesFactory.CreateFailureMechanismSectionAssemblyCategories(
-                assessmentSection.FailureMechanismContribution.SignalingNorm,
-                assessmentSection.FailureMechanismContribution.LowerLimitNorm,
-                failureMechanism.Contribution,
-                failureMechanism.GeneralInput.N);
-
-            switch (categoryType)
-            {
-                case FailureMechanismCategoryType.MechanismSpecificFactorizedSignalingNorm:
-                    return categories.First(c => c.Group == FailureMechanismSectionAssemblyCategoryGroup.IIv)
-                                     .LowerBoundary;
-                case FailureMechanismCategoryType.MechanismSpecificSignalingNorm:
-                    return categories.First(c => c.Group == FailureMechanismSectionAssemblyCategoryGroup.IIIv)
-                                     .LowerBoundary;
-                case FailureMechanismCategoryType.MechanismSpecificLowerLimitNorm:
-                    return categories.First(c => c.Group == FailureMechanismSectionAssemblyCategoryGroup.IVv)
-                                     .LowerBoundary;
-                case FailureMechanismCategoryType.LowerLimitNorm:
-                    return categories.First(c => c.Group == FailureMechanismSectionAssemblyCategoryGroup.Vv)
-                                     .LowerBoundary;
-                case FailureMechanismCategoryType.FactorizedLowerLimitNorm:
-                    return categories.First(c => c.Group == FailureMechanismSectionAssemblyCategoryGroup.VIv)
-                                     .LowerBoundary;
-                default:
-                    throw new NotSupportedException();
-            }
+            return FailureMechanismNormHelper.GetNorm(assessmentSection,
+                                                      categoryType,
+                                                      failureMechanism.Contribution,
+                                                      failureMechanism.GeneralInput.N);
         }
 
         private static RoundedDouble GetAssessmentLevelFromCalculations(HydraulicBoundaryLocation hydraulicBoundaryLocation,
Index: Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Data/Ringtoets.GrassCoverErosionOutwards.Data.csproj
===================================================================
diff -u -rbbbfacd9e38cf43c98dba73e39694850fb932a66 -r9e2f7186181853ea7cce697f737eeca21f82551f
--- Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Data/Ringtoets.GrassCoverErosionOutwards.Data.csproj	(.../Ringtoets.GrassCoverErosionOutwards.Data.csproj)	(revision bbbfacd9e38cf43c98dba73e39694850fb932a66)
+++ Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Data/Ringtoets.GrassCoverErosionOutwards.Data.csproj	(.../Ringtoets.GrassCoverErosionOutwards.Data.csproj)	(revision 9e2f7186181853ea7cce697f737eeca21f82551f)
@@ -61,6 +61,11 @@
       <Name>Ringtoets.Common.Primitives</Name>
       <Private>False</Private>
     </ProjectReference>
+    <ProjectReference Include="..\..\..\Common\src\Ringtoets.Common.Util\Ringtoets.Common.Util.csproj">
+      <Project>{6a074d65-a81c-4c1c-8e24-f36c916e4ed7}</Project>
+      <Name>Ringtoets.Common.Util</Name>
+      <Private>False</Private>
+    </ProjectReference>
     <ProjectReference Include="..\..\..\Revetment\src\Ringtoets.Revetment.Data\Ringtoets.Revetment.Data.csproj">
       <Project>{87c2c553-c0bc-40bf-b1ea-b83bff357f27}</Project>
       <Name>Ringtoets.Revetment.Data</Name>
Index: Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Data.Test/GrassCoverErosionOutwardsFailureMechanismExtensionsTest.cs
===================================================================
diff -u -r7be3118c6dd22f2420d4b9f8eb4fa1c492cf44ea -r9e2f7186181853ea7cce697f737eeca21f82551f
--- Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Data.Test/GrassCoverErosionOutwardsFailureMechanismExtensionsTest.cs	(.../GrassCoverErosionOutwardsFailureMechanismExtensionsTest.cs)	(revision 7be3118c6dd22f2420d4b9f8eb4fa1c492cf44ea)
+++ Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Data.Test/GrassCoverErosionOutwardsFailureMechanismExtensionsTest.cs	(.../GrassCoverErosionOutwardsFailureMechanismExtensionsTest.cs)	(revision 9e2f7186181853ea7cce697f737eeca21f82551f)
@@ -20,7 +20,7 @@
 // All rights reserved.
 
 using System;
-using System.Collections;
+using System.Collections.Generic;
 using System.ComponentModel;
 using Core.Common.Base.Data;
 using Core.Common.TestUtil;
@@ -224,7 +224,7 @@
             Assert.AreEqual(expectedNorm, norm);
         }
 
-        private static IEnumerable GetNormConfigurationPerFailureMechanismCategoryType()
+        private static IEnumerable<TestCaseData> GetNormConfigurationPerFailureMechanismCategoryType()
         {
             const double signalingNorm = 0.002;
             const double lowerLimitNorm = 0.005;