Index: Demo/Ringtoets/src/Demo.Ringtoets/Commands/AddNewDemoAssessmentSectionCommand.cs
===================================================================
diff -u -r74b0bdbaaaf07d590ea85486e34bc639d14fe4e4 -ra053684de9667dfb70aa8cf669e22843c2bd39ed
--- Demo/Ringtoets/src/Demo.Ringtoets/Commands/AddNewDemoAssessmentSectionCommand.cs	(.../AddNewDemoAssessmentSectionCommand.cs)	(revision 74b0bdbaaaf07d590ea85486e34bc639d14fe4e4)
+++ Demo/Ringtoets/src/Demo.Ringtoets/Commands/AddNewDemoAssessmentSectionCommand.cs	(.../AddNewDemoAssessmentSectionCommand.cs)	(revision a053684de9667dfb70aa8cf669e22843c2bd39ed)
@@ -68,8 +68,6 @@
             return demoAssessmentSection;
         }
 
-       
-
         private void InitializeDemoReferenceLine(AssessmentSection demoAssessmentSection)
         {
             using (var embeddedResourceFileWriter = new EmbeddedResourceFileWriter(GetType().Assembly, true, "traject_6-3.shp", "traject_6-3.dbf", "traject_6-3.prj", "traject_6-3.shx"))
@@ -148,7 +146,7 @@
         {
             GrassCoverErosionInwardsFailureMechanism failureMechanism = demoAssessmentSection.GrassCoverErosionInwards;
 
-            var calculation = new GrassCoverErosionInwardsCalculation(failureMechanism.GeneralInput);
+            var calculation = new GrassCoverErosionInwardsCalculation(failureMechanism.GeneralInput, failureMechanism.NormProbabilityInput);
             failureMechanism.CalculationsGroup.Children.Add(calculation);
             calculation.InputParameters.HydraulicBoundaryLocation = demoAssessmentSection.HydraulicBoundaryDatabase.Locations.First(hl => hl.Id == 1300001);
             calculation.InputParameters.NotifyObservers();
Index: Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Data/GrassCoverErosionInwardsCalculation.cs
===================================================================
diff -u -r7f45f1f08a4e6849984063d43bfecfd949b3c3fb -ra053684de9667dfb70aa8cf669e22843c2bd39ed
--- Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Data/GrassCoverErosionInwardsCalculation.cs	(.../GrassCoverErosionInwardsCalculation.cs)	(revision 7f45f1f08a4e6849984063d43bfecfd949b3c3fb)
+++ Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Data/GrassCoverErosionInwardsCalculation.cs	(.../GrassCoverErosionInwardsCalculation.cs)	(revision a053684de9667dfb70aa8cf669e22843c2bd39ed)
@@ -37,16 +37,28 @@
         /// <summary>
         /// Creates a new instance of <see cref="GrassCoverErosionInwardsCalculation"/>.
         /// </summary>
-        /// <param name="generalInputParameters">General grass cover erosion inwards calculation input parameters that apply to each calculation.</param>
-        /// <exception cref="ArgumentNullException">When <paramref name="generalInputParameters"/> is <c>null</c>.</exception>
-        public GrassCoverErosionInwardsCalculation(GeneralGrassCoverErosionInwardsInput generalInputParameters)
+        /// <param name="generalInputParameters">General grass cover erosion inwards calculation input parameters 
+        /// that apply to each calculation.</param>
+        /// <param name="normProbabilityInput">General norm probabilistic parameters that apply to each 
+        /// calculation.</param>
+        /// <exception cref="ArgumentNullException">Thrown when <list type="bullet">
+        /// <item><paramref name="generalInputParameters"/> is <c>null</c>.</item>
+        /// <item><paramref name="normProbabilityInput"/> is <c>null</c>.</item>
+        /// </list> </exception>
+        public GrassCoverErosionInwardsCalculation(GeneralGrassCoverErosionInwardsInput generalInputParameters,
+                                                   NormProbabilityGrassCoverErosionInwardsInput normProbabilityInput)
         {
             if (generalInputParameters == null)
             {
                 throw new ArgumentNullException("generalInputParameters");
             }
+            if (normProbabilityInput == null)
+            {
+                throw new ArgumentNullException("normProbabilityInput");
+            }
             Name = Resources.GrassCoverErosionInwardsCalculation_DefaultName;
             InputParameters = new GrassCoverErosionInwardsInput(generalInputParameters);
+            NormProbabilityInput = normProbabilityInput;
             AddDemoInput();
         }
 
@@ -56,6 +68,11 @@
         public GrassCoverErosionInwardsInput InputParameters { get; private set; }
 
         /// <summary>
+        /// Gets the length-effect parameters.
+        /// </summary>
+        public NormProbabilityGrassCoverErosionInwardsInput NormProbabilityInput { get; private set; }
+
+        /// <summary>
         /// Gets or sets <see cref="GrassCoverErosionInwardsOutput"/>, which contains the results of a grass cover erosion inwards calculation.
         /// </summary>
         public GrassCoverErosionInwardsOutput Output { get; set; }
@@ -105,8 +122,8 @@
             // CriticalFlowRate
             InputParameters.CriticalFlowRate = new LognormalDistribution(4)
             {
-                Mean = new RoundedDouble(4,0.004),
-                StandardDeviation = new RoundedDouble(4,0.0006)
+                Mean = new RoundedDouble(4, 0.004),
+                StandardDeviation = new RoundedDouble(4, 0.0006)
             };
 
             // Dike and Foreshore
Index: Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Plugin/GrassCoverErosionInwardsGuiPlugin.cs
===================================================================
diff -u -ra84ad0dc60c583bc68f6c95c57f3499e16a5f3d1 -ra053684de9667dfb70aa8cf669e22843c2bd39ed
--- Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Plugin/GrassCoverErosionInwardsGuiPlugin.cs	(.../GrassCoverErosionInwardsGuiPlugin.cs)	(revision a84ad0dc60c583bc68f6c95c57f3499e16a5f3d1)
+++ Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Plugin/GrassCoverErosionInwardsGuiPlugin.cs	(.../GrassCoverErosionInwardsGuiPlugin.cs)	(revision a053684de9667dfb70aa8cf669e22843c2bd39ed)
@@ -26,7 +26,6 @@
 using System.IO;
 using System.Linq;
 using System.Windows.Forms;
-using Core.Common.Base.Data;
 using Core.Common.Controls.TreeView;
 using Core.Common.Gui.Forms.ProgressDialog;
 using Core.Common.Gui.Plugin;
@@ -42,6 +41,7 @@
 using Ringtoets.GrassCoverErosionInwards.Forms.PropertyClasses;
 using Ringtoets.GrassCoverErosionInwards.Forms.Views;
 using Ringtoets.GrassCoverErosionInwards.Plugin.Properties;
+using Ringtoets.GrassCoverErosionInwards.Service;
 using Ringtoets.HydraRing.Calculation.Activities;
 using Ringtoets.HydraRing.Calculation.Data;
 using Ringtoets.HydraRing.Calculation.Data.Input.Overtopping;
@@ -70,10 +70,10 @@
         public override IEnumerable<ViewInfo> GetViewInfos()
         {
             yield return new ViewInfo<
-                FailureMechanismSectionResultContext<GrassCoverErosionInwardsFailureMechanismSectionResult>, 
-                IEnumerable<GrassCoverErosionInwardsFailureMechanismSectionResult>, 
+                FailureMechanismSectionResultContext<GrassCoverErosionInwardsFailureMechanismSectionResult>,
+                IEnumerable<GrassCoverErosionInwardsFailureMechanismSectionResult>,
                 GrassCoverErosionInwardsFailureMechanismResultView
-            >
+                >
             {
                 GetViewName = (v, o) => RingtoetsCommonDataResources.FailureMechanism_AssessmentResult_DisplayName,
                 Image = RingtoetsCommonFormsResources.FailureMechanismSectionResultIcon,
@@ -138,7 +138,8 @@
 
         private static ExceedanceProbabilityCalculationActivity CreateHydraRingTargetProbabilityCalculationActivity(FailureMechanismSection failureMechanismSection,
                                                                                                                     string hlcdDirectory,
-                                                                                                                    GrassCoverErosionInwardsCalculation calculation)
+                                                                                                                    GrassCoverErosionInwardsCalculation calculation,
+                                                                                                                    double norm)
         {
             var hydraulicBoundaryLocationId = (int) calculation.InputParameters.HydraulicBoundaryLocation.Id;
             var sectionLength = failureMechanismSection.GetSectionLength();
@@ -165,7 +166,7 @@
                                                 ParseBreakWater(inwardsInput)
                     ),
                 calculation.ClearOutput,
-                output => { ParseHydraRingOutput(calculation, output); });
+                output => { ParseHydraRingOutput(calculation, norm, output); });
         }
 
         private static HydraRingBreakWater ParseBreakWater(GrassCoverErosionInwardsInput input)
@@ -206,26 +207,27 @@
             }
         }
 
-        private static void ParseHydraRingOutput(GrassCoverErosionInwardsCalculation calculation, ExceedanceProbabilityCalculationOutput output)
+        private static void ParseHydraRingOutput(GrassCoverErosionInwardsCalculation calculation, double contribution, ExceedanceProbabilityCalculationOutput output)
         {
             if (output != null)
             {
-                calculation.Output = new GrassCoverErosionInwardsOutput(double.NaN, double.NaN, (RoundedDouble) output.Beta, double.NaN, double.NaN);
+                GrassCoverErosionInwardsOutputCalculationService.Calculate(calculation, contribution, output.Beta);
             }
             else
             {
                 throw new InvalidOperationException(Resources.GrassCoverErosionInwardsGuiPlugin_Error_during_overtopping_calculation);
             }
         }
 
-        private void CalculateAll(IFailureMechanism failureMechanism, IEnumerable<GrassCoverErosionInwardsCalculation> calculations, IAssessmentSection assessmentSection)
+        private void CalculateAll(GrassCoverErosionInwardsFailureMechanism failureMechanism, IEnumerable<GrassCoverErosionInwardsCalculation> calculations, IAssessmentSection assessmentSection)
         {
             // TODO: Remove "Where" filter when validation is implemented
             ActivityProgressDialogRunner.Run(Gui.MainWindow, calculations.Where(calc => calc.InputParameters.HydraulicBoundaryLocation != null)
                                                                          .Select(calc => CreateHydraRingTargetProbabilityCalculationActivity(
                                                                              failureMechanism.Sections.First(), // TODO: Pass dike section based on cross section of calculation with reference line
                                                                              Path.GetDirectoryName(assessmentSection.HydraulicBoundaryDatabase.FilePath),
-                                                                             calc)).ToList());
+                                                                             calc,
+                                                                             assessmentSection.FailureMechanismContribution.Norm)).ToList());
         }
 
         private static string AllDataAvailable(IAssessmentSection assessmentSection, GrassCoverErosionInwardsFailureMechanism failureMechanism)
@@ -251,6 +253,29 @@
             return null;
         }
 
+        #region GrassCoverErosionInwardsFailureMechanismResultView ViewInfo
+
+        private static bool CloseFailureMechanismResultViewForData(GrassCoverErosionInwardsFailureMechanismResultView view, object o)
+        {
+            var assessmentSection = o as IAssessmentSection;
+            var failureMechanism = o as IFailureMechanism;
+            var failureMechanismContext = o as IFailureMechanismContext<IFailureMechanism>;
+            if (assessmentSection != null)
+            {
+                return assessmentSection
+                    .GetFailureMechanisms()
+                    .OfType<GrassCoverErosionInwardsFailureMechanism>()
+                    .Any(fm => ReferenceEquals(view.Data, fm.SectionResults));
+            }
+            if (failureMechanismContext != null)
+            {
+                failureMechanism = failureMechanismContext.WrappedData;
+            }
+            return failureMechanism != null && ReferenceEquals(view.Data, ((FailureMechanismBase<GrassCoverErosionInwardsFailureMechanismSectionResult>) failureMechanism).SectionResults);
+        }
+
+        #endregion
+
         #region GrassCoverErosionInwards TreeNodeInfo
 
         private object[] FailureMechanismEnabledChildNodeObjects(GrassCoverErosionInwardsFailureMechanismContext grassCoverErosionInwardsFailureMechanismContext)
@@ -333,7 +358,7 @@
 
         private static void AddCalculation(GrassCoverErosionInwardsCalculationGroupContext context)
         {
-            var calculation = new GrassCoverErosionInwardsCalculation(context.FailureMechanism.GeneralInput)
+            var calculation = new GrassCoverErosionInwardsCalculation(context.FailureMechanism.GeneralInput, context.FailureMechanism.NormProbabilityInput)
             {
                 Name = NamingHelper.GetUniqueName(context.WrappedData.Children, GrassCoverErosionInwardsDataResources.GrassCoverErosionInwardsCalculation_DefaultName, c => c.Name)
             };
@@ -348,29 +373,6 @@
 
         #endregion
 
-        #region GrassCoverErosionInwardsFailureMechanismResultView ViewInfo
-
-        private static bool CloseFailureMechanismResultViewForData(GrassCoverErosionInwardsFailureMechanismResultView view, object o)
-        {
-            var assessmentSection = o as IAssessmentSection;
-            var failureMechanism = o as IFailureMechanism;
-            var failureMechanismContext = o as IFailureMechanismContext<IFailureMechanism>;
-            if (assessmentSection != null)
-            {
-                return assessmentSection
-                    .GetFailureMechanisms()
-                    .OfType<GrassCoverErosionInwardsFailureMechanism>()
-                    .Any(fm => ReferenceEquals(view.Data, fm.SectionResults));
-            }
-            if (failureMechanismContext != null)
-            {
-                failureMechanism = failureMechanismContext.WrappedData;
-            }
-            return failureMechanism != null && ReferenceEquals(view.Data, ((FailureMechanismBase<GrassCoverErosionInwardsFailureMechanismSectionResult>)failureMechanism).SectionResults);
-        }
-
-        #endregion
-
         #region CalculationGroupContext TreeNodeInfo
 
         private static object[] CalculationGroupContextChildNodeObjects(GrassCoverErosionInwardsCalculationGroupContext nodeData)
@@ -517,7 +519,8 @@
             var activity = CreateHydraRingTargetProbabilityCalculationActivity(
                 context.FailureMechanism.Sections.First(), // TODO: Pass dike section based on cross section of calculation with reference line
                 Path.GetDirectoryName(context.AssessmentSection.HydraulicBoundaryDatabase.FilePath),
-                calculation);
+                calculation,
+                context.AssessmentSection.FailureMechanismContribution.Norm);
 
             ActivityProgressDialogRunner.Run(Gui.MainWindow, activity);
         }
Index: Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Plugin/Ringtoets.GrassCoverErosionInwards.Plugin.csproj
===================================================================
diff -u -rb5dda9752bc1d895c6c88427ef75c1771b671808 -ra053684de9667dfb70aa8cf669e22843c2bd39ed
--- Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Plugin/Ringtoets.GrassCoverErosionInwards.Plugin.csproj	(.../Ringtoets.GrassCoverErosionInwards.Plugin.csproj)	(revision b5dda9752bc1d895c6c88427ef75c1771b671808)
+++ Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Plugin/Ringtoets.GrassCoverErosionInwards.Plugin.csproj	(.../Ringtoets.GrassCoverErosionInwards.Plugin.csproj)	(revision a053684de9667dfb70aa8cf669e22843c2bd39ed)
@@ -119,6 +119,11 @@
       <Name>Ringtoets.GrassCoverErosionInwards.Forms</Name>
       <Private>False</Private>
     </ProjectReference>
+    <ProjectReference Include="..\Ringtoets.GrassCoverErosionInwards.Service\Ringtoets.GrassCoverErosionInwards.Service.csproj">
+      <Project>{2852E99B-AADB-4CBA-B6D2-6882D6113AA3}</Project>
+      <Name>Ringtoets.GrassCoverErosionInwards.Service</Name>
+      <Private>False</Private>
+    </ProjectReference>
   </ItemGroup>
   <ItemGroup>
     <EmbeddedResource Include="Properties\Resources.resx">
Index: Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Service/GrassCoverErosionInwardsOutputCalculationService.cs
===================================================================
diff -u
--- Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Service/GrassCoverErosionInwardsOutputCalculationService.cs	(revision 0)
+++ Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Service/GrassCoverErosionInwardsOutputCalculationService.cs	(revision a053684de9667dfb70aa8cf669e22843c2bd39ed)
@@ -0,0 +1,127 @@
+// Copyright (C) Stichting Deltares 2016. All rights reserved.
+//
+// This file is part of Ringtoets.
+//
+// Ringtoets is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+//
+// All names, logos, and references to "Deltares" are registered trademarks of
+// Stichting Deltares and remain full property of Stichting Deltares at all times.
+// All rights reserved.
+
+using MathNet.Numerics.Distributions;
+using Ringtoets.GrassCoverErosionInwards.Data;
+
+namespace Ringtoets.GrassCoverErosionInwards.Service
+{
+    /// <summary>
+    /// This class is responsible for calculating the parameters required for <see cref="GrassCoverErosionInwardsOutput"/>.
+    /// </summary>
+    public class GrassCoverErosionInwardsOutputCalculationService
+    {
+        // Inputs
+        private readonly double norm;
+        private readonly int lengthEffectN;
+        private readonly double probability;
+
+        // Results
+        private double betaTrajectNorm;
+        private double pTCrossAllowed;
+        private double pTCrossGEKB;
+        private double requiredReliability;
+        private double reliability;
+        private double factorOfSafety;
+
+        private GrassCoverErosionInwardsOutputCalculationService(double norm, int lengthEffectN, double probability)
+        {
+            this.norm = norm;
+            this.lengthEffectN = lengthEffectN;
+            this.probability = probability;
+        }
+
+        /// <summary>
+        /// Calculates 
+        /// </summary>
+        /// <param name="calculation"></param>
+        /// <param name="norm"></param>
+        /// <param name="probability"></param>
+        public static void Calculate(GrassCoverErosionInwardsCalculation calculation, double norm, double probability)
+        {
+            var calculator = new GrassCoverErosionInwardsOutputCalculationService(norm, calculation.NormProbabilityInput.N, probability);
+
+            calculator.Calculate();
+
+            calculation.Output = new GrassCoverErosionInwardsOutput(calculator.betaTrajectNorm,
+                                                                    calculator.requiredReliability,
+                                                                    calculator.probability,
+                                                                    calculator.reliability,
+                                                                    calculator.factorOfSafety);
+        }
+
+        private void Calculate()
+        {
+            CalculateReliability();
+
+            CalculateRequiredReliability();
+
+            factorOfSafety = FactorOfSafety(reliability, requiredReliability);
+        }
+
+        private void CalculateReliability()
+        {
+            betaTrajectNorm = BetaTrajectNorm(norm);
+            pTCrossAllowed = PTCrossAllowed(probability, norm, lengthEffectN);
+            pTCrossGEKB = PTCrossGEKB();
+        }
+
+        private void CalculateRequiredReliability()
+        {
+            requiredReliability = BetaCrossAllowed(pTCrossAllowed);
+            reliability = BetaCrossGEKB(pTCrossGEKB);
+        }
+
+        #region Sub calculations
+
+        private static double BetaTrajectNorm(double contribution)
+        {
+            return new Normal().InverseCumulativeDistribution(1 - 1.0/contribution);
+        }
+
+        private static double PTCrossAllowed(double probability, double contribution, double n)
+        {
+            return probability*(1.0/contribution)/n;
+        }
+
+        private static double PTCrossGEKB()
+        {
+            return 1.0/50000;
+        }
+
+        private static double BetaCrossAllowed(double pTCrossAllowed)
+        {
+            return new Normal().InverseCumulativeDistribution(1 - pTCrossAllowed);
+        }
+
+        private static double BetaCrossGEKB(double pTCrossGEKB)
+        {
+            return new Normal().InverseCumulativeDistribution(1 - pTCrossGEKB);
+        }
+
+        private static double FactorOfSafety(double betaCrossGekb, double betaCrossAllowed)
+        {
+            return betaCrossGekb/betaCrossAllowed;
+        }
+
+        #endregion
+    }
+}
\ No newline at end of file
Index: Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Service/Ringtoets.GrassCoverErosionInwards.Service.csproj
===================================================================
diff -u -r1a6060cc0ba5e1ff43abf596b4b956942e76a978 -ra053684de9667dfb70aa8cf669e22843c2bd39ed
--- Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Service/Ringtoets.GrassCoverErosionInwards.Service.csproj	(.../Ringtoets.GrassCoverErosionInwards.Service.csproj)	(revision 1a6060cc0ba5e1ff43abf596b4b956942e76a978)
+++ Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Service/Ringtoets.GrassCoverErosionInwards.Service.csproj	(.../Ringtoets.GrassCoverErosionInwards.Service.csproj)	(revision a053684de9667dfb70aa8cf669e22843c2bd39ed)
@@ -32,8 +32,13 @@
     <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
   </PropertyGroup>
   <ItemGroup>
+    <Reference Include="MathNet.Numerics, Version=3.8.0.0, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>..\..\..\..\packages\MathNet.Numerics.3.8.0\lib\net40\MathNet.Numerics.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
     <Reference Include="System" />
     <Reference Include="System.Core" />
+    <Reference Include="System.Numerics" />
     <Reference Include="System.Xml.Linq" />
     <Reference Include="System.Data.DataSetExtensions" />
     <Reference Include="Microsoft.CSharp" />
@@ -44,18 +49,35 @@
     <Compile Include="..\..\..\..\Core\Common\src\Core.Common.Version\GlobalAssembly.cs">
       <Link>Properties\GlobalAssembly.cs</Link>
     </Compile>
+    <Compile Include="GrassCoverErosionInwardsOutputCalculationService.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
   </ItemGroup>
   <ItemGroup>
     <None Include="..\..\..\..\build\Copying.licenseheader">
       <Link>Copying.licenseheader</Link>
     </None>
+    <None Include="packages.config" />
   </ItemGroup>
   <ItemGroup>
+    <ProjectReference Include="..\..\..\..\Core\Common\src\Core.Common.Base\Core.Common.Base.csproj">
+      <Project>{3bbfd65b-b277-4e50-ae6d-bd24c3434609}</Project>
+      <Name>Core.Common.Base</Name>
+      <Private>False</Private>
+    </ProjectReference>
     <ProjectReference Include="..\..\..\..\Core\Common\src\Core.Common.Version\Core.Common.Version.csproj">
       <Project>{c90b77da-e421-43cc-b82e-529651bc21ac}</Project>
       <Name>Core.Common.Version</Name>
     </ProjectReference>
+    <ProjectReference Include="..\..\..\Common\src\Ringtoets.Common.Data\Ringtoets.Common.Data.csproj">
+      <Project>{d4200f43-3f72-4f42-af0a-8ced416a38ec}</Project>
+      <Name>Ringtoets.Common.Data</Name>
+      <Private>False</Private>
+    </ProjectReference>
+    <ProjectReference Include="..\Ringtoets.GrassCoverErosionInwards.Data\Ringtoets.GrassCoverErosionInwards.Data.csproj">
+      <Project>{90DE728E-48EF-4665-AB38-3D88E41D9F4D}</Project>
+      <Name>Ringtoets.GrassCoverErosionInwards.Data</Name>
+      <Private>False</Private>
+    </ProjectReference>
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
Index: Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Service/packages.config
===================================================================
diff -u
--- Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Service/packages.config	(revision 0)
+++ Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Service/packages.config	(revision a053684de9667dfb70aa8cf669e22843c2bd39ed)
@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<!--
+Copyright (C) Stichting Deltares 2016. All rights reserved.
+
+This file is part of Ringtoets.
+
+Ringtoets is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+All names, logos, and references to "Deltares" are registered trademarks of
+Stichting Deltares and remain full property of Stichting Deltares at all times.
+All rights reserved.
+-->
+<packages>
+  <package id="MathNet.Numerics" version="3.8.0" targetFramework="net40" />
+</packages>
\ No newline at end of file
Index: Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Data.Test/GrassCoverErosionInwardsCalculationTest.cs
===================================================================
diff -u -r4539b4546747c257739b1695b9ebc9c29e393ffe -ra053684de9667dfb70aa8cf669e22843c2bd39ed
--- Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Data.Test/GrassCoverErosionInwardsCalculationTest.cs	(.../GrassCoverErosionInwardsCalculationTest.cs)	(revision 4539b4546747c257739b1695b9ebc9c29e393ffe)
+++ Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Data.Test/GrassCoverErosionInwardsCalculationTest.cs	(.../GrassCoverErosionInwardsCalculationTest.cs)	(revision a053684de9667dfb70aa8cf669e22843c2bd39ed)
@@ -35,21 +35,40 @@
         [Test]
         public void Constructor_NullGeneralInput_ThrowsArgumentNullException()
         {
-            // Setup & Call
-            TestDelegate test = () => new GrassCoverErosionInwardsCalculation(null);
+            // Setup
+            var normProbabilityInput = new NormProbabilityGrassCoverErosionInwardsInput();
 
+            // Call
+            TestDelegate test = () => new GrassCoverErosionInwardsCalculation(null, normProbabilityInput);
+
             // Assert
-            Assert.Throws<ArgumentNullException>(test);
+            var exception = Assert.Throws<ArgumentNullException>(test);
+            Assert.AreEqual("generalInputParameters", exception.ParamName);
         }
 
         [Test]
+        public void Constructor_NullNormProbabilityGrassCoverErosionInwardsInput_ThrowsArgumentNullException()
+        {
+            // Setup
+            var generalInput = new GeneralGrassCoverErosionInwardsInput();
+
+            // Call
+            TestDelegate test = () => new GrassCoverErosionInwardsCalculation(generalInput, null);
+
+            // Assert
+            var exception = Assert.Throws<ArgumentNullException>(test);
+            Assert.AreEqual("normProbabilityInput", exception.ParamName);
+        }
+
+        [Test]
         public void Constructor_DefaultPropertyValuesAreSet()
         {
             // Setup
             var generalInput = new GeneralGrassCoverErosionInwardsInput();
+            var normProbabilityInput = new NormProbabilityGrassCoverErosionInwardsInput();
 
             // Call
-            var calculation = new GrassCoverErosionInwardsCalculation(generalInput);
+            var calculation = new GrassCoverErosionInwardsCalculation(generalInput, normProbabilityInput);
 
             // Assert
             Assert.IsInstanceOf<ICalculation>(calculation);
@@ -60,6 +79,7 @@
             Assert.IsNull(calculation.Comments);
             Assert.IsNull(calculation.Output);
             Assert.IsInstanceOf<Observable>(calculation);
+            Assert.AreEqual(normProbabilityInput, calculation.NormProbabilityInput);
             AssertDemoInput(calculation.InputParameters);
         }
 
@@ -71,7 +91,8 @@
         {
             // Setup
             var generalInput = new GeneralGrassCoverErosionInwardsInput();
-            var calculation = new GrassCoverErosionInwardsCalculation(generalInput);
+            var normProbabilityInput = new NormProbabilityGrassCoverErosionInwardsInput();
+            var calculation = new GrassCoverErosionInwardsCalculation(generalInput, normProbabilityInput);
 
             // Call
             calculation.Name = name;
@@ -88,7 +109,8 @@
         {
             // Setup
             var generalInput = new GeneralGrassCoverErosionInwardsInput();
-            var calculation = new GrassCoverErosionInwardsCalculation(generalInput);
+            var normProbabilityInput = new NormProbabilityGrassCoverErosionInwardsInput();
+            var calculation = new GrassCoverErosionInwardsCalculation(generalInput, normProbabilityInput);
 
             // Call
             calculation.Comments = comments;
@@ -102,7 +124,8 @@
         {
             // Setup
             var generalInput = new GeneralGrassCoverErosionInwardsInput();
-            var calculation = new GrassCoverErosionInwardsCalculation(generalInput)
+            var normProbabilityInput = new NormProbabilityGrassCoverErosionInwardsInput();
+            var calculation = new GrassCoverErosionInwardsCalculation(generalInput, normProbabilityInput)
             {
                 Output = new TestGrassCoverErosionInwardsOutput()
             };
@@ -119,7 +142,8 @@
         {
             // Setup
             var generalInput = new GeneralGrassCoverErosionInwardsInput();
-            var calculation = new GrassCoverErosionInwardsCalculation(generalInput)
+            var normProbabilityInput = new NormProbabilityGrassCoverErosionInwardsInput();
+            var calculation = new GrassCoverErosionInwardsCalculation(generalInput, normProbabilityInput)
             {
                 Output = null
             };
@@ -133,7 +157,8 @@
         {
             // Setup
             var generalInput = new GeneralGrassCoverErosionInwardsInput();
-            var calculation = new GrassCoverErosionInwardsCalculation(generalInput)
+            var normProbabilityInput = new NormProbabilityGrassCoverErosionInwardsInput();
+            var calculation = new GrassCoverErosionInwardsCalculation(generalInput, normProbabilityInput)
             {
                 Output = new TestGrassCoverErosionInwardsOutput()
             };
@@ -147,7 +172,8 @@
         {
             // Setup
             var generalInput = new GeneralGrassCoverErosionInwardsInput();
-            var calculation = new GrassCoverErosionInwardsCalculation(generalInput);
+            var normProbabilityInput = new NormProbabilityGrassCoverErosionInwardsInput();
+            var calculation = new GrassCoverErosionInwardsCalculation(generalInput, normProbabilityInput);
             var hydraulicBoundaryLocation = new HydraulicBoundaryLocation(1, "test", 1.0, 2.0);
             calculation.InputParameters.HydraulicBoundaryLocation = hydraulicBoundaryLocation;
 
@@ -166,7 +192,8 @@
         {
             // Setup
             var generalInput = new GeneralGrassCoverErosionInwardsInput();
-            var calculation = new GrassCoverErosionInwardsCalculation(generalInput);
+            var normProbabilityInput = new NormProbabilityGrassCoverErosionInwardsInput();
+            var calculation = new GrassCoverErosionInwardsCalculation(generalInput, normProbabilityInput);
             var inputParameters = calculation.InputParameters;
 
             // Call
@@ -181,7 +208,9 @@
         {
             // Setup
             var output = new GrassCoverErosionInwardsOutput(2.0, 3.0, 1.4, 50.3, 16.3);
-            var calculation = new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput())
+            var generalInput = new GeneralGrassCoverErosionInwardsInput();
+            var normProbabilityInput = new NormProbabilityGrassCoverErosionInwardsInput();
+            var calculation = new GrassCoverErosionInwardsCalculation(generalInput, normProbabilityInput)
             {
                 Output = output
             };
Index: Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Data.TestUtil.Test/GrassCoverErosionInwardsCalculationFactoryTest.cs
===================================================================
diff -u -r4539b4546747c257739b1695b9ebc9c29e393ffe -ra053684de9667dfb70aa8cf669e22843c2bd39ed
--- Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Data.TestUtil.Test/GrassCoverErosionInwardsCalculationFactoryTest.cs	(.../GrassCoverErosionInwardsCalculationFactoryTest.cs)	(revision 4539b4546747c257739b1695b9ebc9c29e393ffe)
+++ Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Data.TestUtil.Test/GrassCoverErosionInwardsCalculationFactoryTest.cs	(.../GrassCoverErosionInwardsCalculationFactoryTest.cs)	(revision a053684de9667dfb70aa8cf669e22843c2bd39ed)
@@ -38,7 +38,8 @@
             var calculation = GrassCoverErosionInwardsCalculationFactory.CreateCalculationWithInvalidData();
 
             // Assert
-            var emptyCalculation = new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput());
+            var emptyCalculation = new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput(),
+                                                                           new NormProbabilityGrassCoverErosionInwardsInput());
             AssertGrassCoverErosionInwardsCalculationAreEqual(emptyCalculation, calculation);
         }
 
@@ -54,7 +55,8 @@
                 DesignWaterLevel = (RoundedDouble) 1.0
             };
 
-            var validCalculation = new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput())
+            var validCalculation = new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput(),
+                                                                           new NormProbabilityGrassCoverErosionInwardsInput())
             {
                 InputParameters =
                 {
Index: Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Data.TestUtil/GrassCoverErosionInwardsCalculationFactory.cs
===================================================================
diff -u -r4435a35be229b12da5859395985ad38c9c5d4729 -ra053684de9667dfb70aa8cf669e22843c2bd39ed
--- Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Data.TestUtil/GrassCoverErosionInwardsCalculationFactory.cs	(.../GrassCoverErosionInwardsCalculationFactory.cs)	(revision 4435a35be229b12da5859395985ad38c9c5d4729)
+++ Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Data.TestUtil/GrassCoverErosionInwardsCalculationFactory.cs	(.../GrassCoverErosionInwardsCalculationFactory.cs)	(revision a053684de9667dfb70aa8cf669e22843c2bd39ed)
@@ -36,7 +36,8 @@
         /// <returns>A new instance of <see cref="GrassCoverErosionInwardsCalculation"/> without data.</returns>
         public static GrassCoverErosionInwardsCalculation CreateCalculationWithInvalidData()
         {
-            return new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput());
+            return new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput(),
+                                                           new NormProbabilityGrassCoverErosionInwardsInput());
         }
 
         /// <summary>
@@ -50,7 +51,8 @@
                 DesignWaterLevel = (RoundedDouble) 1.0
             };
 
-            return new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput())
+            return new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput(),
+                                                           new NormProbabilityGrassCoverErosionInwardsInput())
             {
                 InputParameters =
                 {
Index: Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Forms.Test/PropertyClasses/GrassCoverErosionInwardsCalculationContextPropertiesTest.cs
===================================================================
diff -u -reaa8b3e276e1a0a6a4d0a2f96016879d8d12d394 -ra053684de9667dfb70aa8cf669e22843c2bd39ed
--- Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Forms.Test/PropertyClasses/GrassCoverErosionInwardsCalculationContextPropertiesTest.cs	(.../GrassCoverErosionInwardsCalculationContextPropertiesTest.cs)	(revision eaa8b3e276e1a0a6a4d0a2f96016879d8d12d394)
+++ Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Forms.Test/PropertyClasses/GrassCoverErosionInwardsCalculationContextPropertiesTest.cs	(.../GrassCoverErosionInwardsCalculationContextPropertiesTest.cs)	(revision a053684de9667dfb70aa8cf669e22843c2bd39ed)
@@ -81,9 +81,10 @@
             var assessmentSectionMock = mockRepository.StrictMock<IAssessmentSection>();
             var failureMechanismMock = mockRepository.StrictMock<GrassCoverErosionInwardsFailureMechanism>();
             var generalInput = new GeneralGrassCoverErosionInwardsInput();
+            var normProbabilityInput = new NormProbabilityGrassCoverErosionInwardsInput();
             mockRepository.ReplayAll();
 
-            var calculation = new GrassCoverErosionInwardsCalculation(generalInput);
+            var calculation = new GrassCoverErosionInwardsCalculation(generalInput, normProbabilityInput);
             calculation.Attach(observerMock);
             var properties = new GrassCoverErosionInwardsCalculationContextProperties
             {
Index: Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Forms.Test/TreeNodeInfos/GrassCoverErosionInwardsCalculationContextTreeNodeInfoTest.cs
===================================================================
diff -u -rde6ffafc792b3f154436127cca3ccd922776df09 -ra053684de9667dfb70aa8cf669e22843c2bd39ed
--- Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Forms.Test/TreeNodeInfos/GrassCoverErosionInwardsCalculationContextTreeNodeInfoTest.cs	(.../GrassCoverErosionInwardsCalculationContextTreeNodeInfoTest.cs)	(revision de6ffafc792b3f154436127cca3ccd922776df09)
+++ Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Forms.Test/TreeNodeInfos/GrassCoverErosionInwardsCalculationContextTreeNodeInfoTest.cs	(.../GrassCoverErosionInwardsCalculationContextTreeNodeInfoTest.cs)	(revision a053684de9667dfb70aa8cf669e22843c2bd39ed)
@@ -96,7 +96,7 @@
             var assessmentSectionMock = mocks.StrictMock<IAssessmentSection>();
             mocks.ReplayAll();
 
-            var calculation = new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput());
+            var calculation = new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput(), new NormProbabilityGrassCoverErosionInwardsInput());
             var failureMechanism = new GrassCoverErosionInwardsFailureMechanism();
             var calculationContext = new GrassCoverErosionInwardsCalculationContext(calculation, failureMechanism, assessmentSectionMock);
 
@@ -142,7 +142,8 @@
 
             var failureMechanism = new GrassCoverErosionInwardsFailureMechanism();
             var assessmentSectionMock = mocks.StrictMock<IAssessmentSection>();
-            var calculation = new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput());
+            var calculation = new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput(),
+                                                                      new NormProbabilityGrassCoverErosionInwardsInput());
 
             var nodeData = new GrassCoverErosionInwardsCalculationContext(calculation, failureMechanism, assessmentSectionMock);
 
@@ -166,7 +167,8 @@
             var treeViewControlMock = mocks.StrictMock<TreeViewControl>();
             var failureMechanism = new GrassCoverErosionInwardsFailureMechanism();
             var assessmentSectionMock = mocks.StrictMock<IAssessmentSection>();
-            var calculation = new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput());
+            var calculation = new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput(),
+                                                                      new NormProbabilityGrassCoverErosionInwardsInput());
 
             var nodeData = new GrassCoverErosionInwardsCalculationContext(calculation, failureMechanism, assessmentSectionMock);
             var gui = mocks.StrictMock<IGui>();
@@ -205,7 +207,8 @@
             var assessmentSectionMock = mocks.StrictMock<IAssessmentSection>();
             assessmentSectionMock.Expect(asm => asm.HydraulicBoundaryDatabase).Return(null);
 
-            var calculation = new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput());
+            var calculation = new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput(),
+                                                                      new NormProbabilityGrassCoverErosionInwardsInput());
 
             var nodeData = new GrassCoverErosionInwardsCalculationContext(calculation, failureMechanism, assessmentSectionMock);
 
@@ -244,7 +247,8 @@
             var assessmentSectionMock = mocks.StrictMock<IAssessmentSection>();
             assessmentSectionMock.Stub(asm => asm.HydraulicBoundaryDatabase).Return(new HydraulicBoundaryDatabase());
 
-            var calculation = new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput());
+            var calculation = new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput(),
+                                                                      new NormProbabilityGrassCoverErosionInwardsInput());
 
             var nodeData = new GrassCoverErosionInwardsCalculationContext(calculation, failureMechanism, assessmentSectionMock);
 
@@ -292,7 +296,8 @@
             var assessmentSectionMock = mocks.StrictMock<IAssessmentSection>();
             assessmentSectionMock.Stub(asm => asm.HydraulicBoundaryDatabase).Return(hydraulicBoundaryDatabase);
 
-            var calculation = new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput());
+            var calculation = new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput(),
+                                                                      new NormProbabilityGrassCoverErosionInwardsInput());
 
             var nodeData = new GrassCoverErosionInwardsCalculationContext(calculation, failureMechanism, assessmentSectionMock);
 
@@ -345,7 +350,8 @@
 
             var assessmentSectionMock = mocks.StrictMock<IAssessmentSection>();
             assessmentSectionMock.Stub(asm => asm.HydraulicBoundaryDatabase).Return(hydraulicBoundaryDatabase);
-            var calculation = new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput())
+            var calculation = new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput(),
+                                                                      new NormProbabilityGrassCoverErosionInwardsInput())
             {
                 Output = new GrassCoverErosionInwardsOutput(double.NaN, double.NaN, double.NaN, double.NaN, double.NaN),
                 InputParameters =
@@ -397,11 +403,13 @@
             var observer = mocks.StrictMock<IObserver>();
             observer.Expect(o => o.UpdateObserver());
 
-            var elementToBeRemoved = new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput());
+            var elementToBeRemoved = new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput(),
+                                                                             new NormProbabilityGrassCoverErosionInwardsInput());
 
             var group = new CalculationGroup("", groupNameEditable);
             group.Children.Add(elementToBeRemoved);
-            group.Children.Add(new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput()));
+            group.Children.Add(new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput(),
+                                                                       new NormProbabilityGrassCoverErosionInwardsInput()));
             group.Attach(observer);
 
             var failureMechanism = new GrassCoverErosionInwardsFailureMechanism();
Index: Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Forms.Test/TreeNodeInfos/GrassCoverErosionInwardsCalculationGroupContextTreeNodeInfoTest.cs
===================================================================
diff -u -rba695b5898e5496e3641f5e676a7717993b04358 -ra053684de9667dfb70aa8cf669e22843c2bd39ed
--- Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Forms.Test/TreeNodeInfos/GrassCoverErosionInwardsCalculationGroupContextTreeNodeInfoTest.cs	(.../GrassCoverErosionInwardsCalculationGroupContextTreeNodeInfoTest.cs)	(revision ba695b5898e5496e3641f5e676a7717993b04358)
+++ Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Forms.Test/TreeNodeInfos/GrassCoverErosionInwardsCalculationGroupContextTreeNodeInfoTest.cs	(.../GrassCoverErosionInwardsCalculationGroupContextTreeNodeInfoTest.cs)	(revision a053684de9667dfb70aa8cf669e22843c2bd39ed)
@@ -112,7 +112,7 @@
             var failureMechanism = new GrassCoverErosionInwardsFailureMechanism();
             var group = new CalculationGroup();
             var childGroup = new CalculationGroup();
-            var childCalculation = new GrassCoverErosionInwardsCalculation(failureMechanism.GeneralInput);
+            var childCalculation = new GrassCoverErosionInwardsCalculation(failureMechanism.GeneralInput, failureMechanism.NormProbabilityInput);
 
             group.Children.Add(childGroup);
             group.Children.Add(calculationItem);
@@ -253,7 +253,7 @@
             {
                 Children =
                 {
-                    new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput())
+                    new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput(), new NormProbabilityGrassCoverErosionInwardsInput())
                 }
             };
 
@@ -294,7 +294,7 @@
             {
                 Children =
                 {
-                    new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput())
+                    new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput(), new NormProbabilityGrassCoverErosionInwardsInput())
                 }
             };
 
@@ -304,7 +304,7 @@
                 new Point2D(0, 0)
             }));
             failureMechanism.CalculationsGroup.Children.Add(
-                new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput()));
+                new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput(), new NormProbabilityGrassCoverErosionInwardsInput()));
 
             var assessmentSectionMock = mocks.StrictMock<IAssessmentSection>();
             assessmentSectionMock.Stub(asm => asm.HydraulicBoundaryDatabase).Return(null);
@@ -347,7 +347,7 @@
             {
                 Children =
                 {
-                    new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput())
+                    new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput(), new NormProbabilityGrassCoverErosionInwardsInput())
                 }
             };
 
@@ -357,7 +357,7 @@
                 new Point2D(0, 0)
             }));
             failureMechanism.CalculationsGroup.Children.Add(
-                new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput()));
+                new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput(), new NormProbabilityGrassCoverErosionInwardsInput()));
 
             var assessmentSectionMock = mocks.StrictMock<IAssessmentSection>();
             assessmentSectionMock.Stub(asm => asm.HydraulicBoundaryDatabase).Return(new HydraulicBoundaryDatabase());
@@ -401,7 +401,7 @@
             {
                 Children =
                 {
-                    new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput())
+                    new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput(), new NormProbabilityGrassCoverErosionInwardsInput())
                 }
             };
 
@@ -419,7 +419,7 @@
                 new Point2D(0, 0)
             }));
             failureMechanism.CalculationsGroup.Children.Add(
-                new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput()));
+                new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput(), new NormProbabilityGrassCoverErosionInwardsInput()));
 
             var assessmentSectionMock = mocks.StrictMock<IAssessmentSection>();
             assessmentSectionMock.Stub(asm => asm.HydraulicBoundaryDatabase).Return(hydraulicBoundaryDatabase);
@@ -673,7 +673,7 @@
                                                                                      failureMechanism,
                                                                                      assessmentSectionMock);
 
-            var calculationItem = new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput())
+            var calculationItem = new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput(), new NormProbabilityGrassCoverErosionInwardsInput())
             {
                 Name = "Nieuwe berekening"
             };
@@ -751,7 +751,7 @@
             var group = new CalculationGroup();
             var failureMechanism = new GrassCoverErosionInwardsFailureMechanism();
 
-            var calculation = new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput());
+            var calculation = new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput(), new NormProbabilityGrassCoverErosionInwardsInput());
 
             group.Children.Add(calculation);
 
Index: Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Forms.Test/TreeNodeInfos/GrassCoverErosionInwardsFailureMechanismContextTreeNodeInfoTest.cs
===================================================================
diff -u -rde6ffafc792b3f154436127cca3ccd922776df09 -ra053684de9667dfb70aa8cf669e22843c2bd39ed
--- Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Forms.Test/TreeNodeInfos/GrassCoverErosionInwardsFailureMechanismContextTreeNodeInfoTest.cs	(.../GrassCoverErosionInwardsFailureMechanismContextTreeNodeInfoTest.cs)	(revision de6ffafc792b3f154436127cca3ccd922776df09)
+++ Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Forms.Test/TreeNodeInfos/GrassCoverErosionInwardsFailureMechanismContextTreeNodeInfoTest.cs	(.../GrassCoverErosionInwardsFailureMechanismContextTreeNodeInfoTest.cs)	(revision a053684de9667dfb70aa8cf669e22843c2bd39ed)
@@ -427,7 +427,8 @@
             // Setup
             var gui = mocksRepository.StrictMock<IGui>();
             var failureMechanism = new GrassCoverErosionInwardsFailureMechanism();
-            failureMechanism.CalculationsGroup.Children.Add(new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput()));
+            failureMechanism.CalculationsGroup.Children.Add(new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput(), 
+                new NormProbabilityGrassCoverErosionInwardsInput()));
             var assessmentSectionMock = mocksRepository.StrictMock<IAssessmentSection>();
 
             var nodeData = new GrassCoverErosionInwardsFailureMechanismContext(failureMechanism, assessmentSectionMock);
@@ -465,7 +466,8 @@
             var gui = mocksRepository.StrictMock<IGui>();
             var failureMechanism = new GrassCoverErosionInwardsFailureMechanism();
             failureMechanism.AddSection(new FailureMechanismSection("test", new[] { new Point2D(0, 0) }));
-            failureMechanism.CalculationsGroup.Children.Add(new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput()));
+            failureMechanism.CalculationsGroup.Children.Add(new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput(), 
+                new NormProbabilityGrassCoverErosionInwardsInput()));
             
             var assessmentSectionMock = mocksRepository.StrictMock<IAssessmentSection>();
             assessmentSectionMock.Expect(asm => asm.HydraulicBoundaryDatabase).Return(null);
@@ -506,7 +508,8 @@
             var gui = mocksRepository.StrictMock<IGui>();
             var failureMechanism = new GrassCoverErosionInwardsFailureMechanism();
             failureMechanism.AddSection(new FailureMechanismSection("test", new[] { new Point2D(0, 0) }));
-            failureMechanism.CalculationsGroup.Children.Add(new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput()));
+            failureMechanism.CalculationsGroup.Children.Add(new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput(),
+                new NormProbabilityGrassCoverErosionInwardsInput()));
 
             var assessmentSectionMock = mocksRepository.StrictMock<IAssessmentSection>();
             assessmentSectionMock.Stub(asm => asm.HydraulicBoundaryDatabase).Return(new HydraulicBoundaryDatabase());
@@ -548,7 +551,8 @@
             var gui = mocksRepository.StrictMock<IGui>();
             var failureMechanism = new GrassCoverErosionInwardsFailureMechanism();
             failureMechanism.AddSection(new FailureMechanismSection("test", new[] { new Point2D(0, 0) }));
-            failureMechanism.CalculationsGroup.Children.Add(new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput()));
+            failureMechanism.CalculationsGroup.Children.Add(new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput(), 
+                new NormProbabilityGrassCoverErosionInwardsInput()));
 
             string validFilePath = Path.Combine(testDataPath, "complete.sqlite");
 
Index: Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Service.Test/GrassCoverErosionInwardsOutputCalculationServiceTest.cs
===================================================================
diff -u
--- Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Service.Test/GrassCoverErosionInwardsOutputCalculationServiceTest.cs	(revision 0)
+++ Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Service.Test/GrassCoverErosionInwardsOutputCalculationServiceTest.cs	(revision a053684de9667dfb70aa8cf669e22843c2bd39ed)
@@ -0,0 +1,48 @@
+// Copyright (C) Stichting Deltares 2016. All rights reserved.
+//
+// This file is part of Ringtoets.
+//
+// Ringtoets is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+//
+// All names, logos, and references to "Deltares" are registered trademarks of
+// Stichting Deltares and remain full property of Stichting Deltares at all times.
+// All rights reserved.
+
+using Core.Common.Base.Data;
+using NUnit.Framework;
+using Ringtoets.GrassCoverErosionInwards.Data;
+
+namespace Ringtoets.GrassCoverErosionInwards.Service.Test
+{
+    [TestFixture]
+    public class GrassCoverErosionInwardsOutputCalculationServiceTest
+    {
+        [Test]
+        public void Calculate_CompleteInput_ReturnsGrassCoverErosionInwardsOutputWithValues()
+        {
+            // Setup
+            var norm = 30000;
+            var probability = 0.24;
+            var calculation = new GrassCoverErosionInwardsCalculation(new GeneralGrassCoverErosionInwardsInput(),
+                                                                      new NormProbabilityGrassCoverErosionInwardsInput());
+
+            // Call
+            GrassCoverErosionInwardsOutputCalculationService.Calculate(calculation, norm, probability);
+
+            // Assert
+            RoundedDouble result = calculation.Output.FactorOfSafety;
+            Assert.AreEqual(0.919890363, result, 1e-2);
+        }
+    }
+}
\ No newline at end of file
Index: Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Service.Test/Ringtoets.GrassCoverErosionInwards.Service.Test.csproj
===================================================================
diff -u -r07efb7c80815d1747386437cf8dcd6db25b9160a -ra053684de9667dfb70aa8cf669e22843c2bd39ed
--- Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Service.Test/Ringtoets.GrassCoverErosionInwards.Service.Test.csproj	(.../Ringtoets.GrassCoverErosionInwards.Service.Test.csproj)	(revision 07efb7c80815d1747386437cf8dcd6db25b9160a)
+++ Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Service.Test/Ringtoets.GrassCoverErosionInwards.Service.Test.csproj	(.../Ringtoets.GrassCoverErosionInwards.Service.Test.csproj)	(revision a053684de9667dfb70aa8cf669e22843c2bd39ed)
@@ -54,6 +54,7 @@
     <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="GrassCoverErosionInwardsOutputCalculationServiceTest.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
   </ItemGroup>
   <ItemGroup>
@@ -62,6 +63,24 @@
     </None>
     <None Include="packages.config" />
   </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\..\..\..\Core\Common\src\Core.Common.Base\Core.Common.Base.csproj">
+      <Project>{3bbfd65b-b277-4e50-ae6d-bd24c3434609}</Project>
+      <Name>Core.Common.Base</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\..\..\Common\src\Ringtoets.Common.Data\Ringtoets.Common.Data.csproj">
+      <Project>{d4200f43-3f72-4f42-af0a-8ced416a38ec}</Project>
+      <Name>Ringtoets.Common.Data</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\..\src\Ringtoets.GrassCoverErosionInwards.Data\Ringtoets.GrassCoverErosionInwards.Data.csproj">
+      <Project>{90DE728E-48EF-4665-AB38-3D88E41D9F4D}</Project>
+      <Name>Ringtoets.GrassCoverErosionInwards.Data</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\..\src\Ringtoets.GrassCoverErosionInwards.Service\Ringtoets.GrassCoverErosionInwards.Service.csproj">
+      <Project>{2852E99B-AADB-4CBA-B6D2-6882D6113AA3}</Project>
+      <Name>Ringtoets.GrassCoverErosionInwards.Service</Name>
+    </ProjectReference>
+  </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.
Index: Ringtoets/Piping/src/Ringtoets.Piping.Service/PipingSemiProbabilisticCalculationService.cs
===================================================================
diff -u -rc5f90c4f9b42d985f16f99ad8732576b9217267a -ra053684de9667dfb70aa8cf669e22843c2bd39ed
--- Ringtoets/Piping/src/Ringtoets.Piping.Service/PipingSemiProbabilisticCalculationService.cs	(.../PipingSemiProbabilisticCalculationService.cs)	(revision c5f90c4f9b42d985f16f99ad8732576b9217267a)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Service/PipingSemiProbabilisticCalculationService.cs	(.../PipingSemiProbabilisticCalculationService.cs)	(revision a053684de9667dfb70aa8cf669e22843c2bd39ed)
@@ -175,7 +175,7 @@
         {
             if (!calculation.HasOutput)
             {
-                throw new ArgumentException("Cannot perform a semi-probabilistic calculation without output form the piping kernel.");
+                throw new ArgumentException("Cannot perform a semi-probabilistic calculation without output from the piping kernel.");
             }
         }
 
Index: Ringtoets/Piping/test/Ringtoets.Piping.Service.Test/PipingSemiProbabilisticCalculationServiceTest.cs
===================================================================
diff -u -rc5f90c4f9b42d985f16f99ad8732576b9217267a -ra053684de9667dfb70aa8cf669e22843c2bd39ed
--- Ringtoets/Piping/test/Ringtoets.Piping.Service.Test/PipingSemiProbabilisticCalculationServiceTest.cs	(.../PipingSemiProbabilisticCalculationServiceTest.cs)	(revision c5f90c4f9b42d985f16f99ad8732576b9217267a)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Service.Test/PipingSemiProbabilisticCalculationServiceTest.cs	(.../PipingSemiProbabilisticCalculationServiceTest.cs)	(revision a053684de9667dfb70aa8cf669e22843c2bd39ed)
@@ -11,10 +11,10 @@
     public class PipingSemiProbabilisticCalculationServiceTest
     {
         [Test]
-        [TestCase(30000, 1.2, 1.0 / 7.36633055700265E-06)]
-        [TestCase(30000, 1.0, 1.0 / 4.13743266617776E-05)]
-        [TestCase(20000, 1.2, 1.0 / 9.53352884976163E-06)]
-        [TestCase(20000, 1.0, 1.0 / 5.24016937211752E-05)]
+        [TestCase(30000, 1.2, 1.0/7.36633055700265E-06)]
+        [TestCase(30000, 1.0, 1.0/4.13743266617776E-05)]
+        [TestCase(20000, 1.2, 1.0/9.53352884976163E-06)]
+        [TestCase(20000, 1.0, 1.0/5.24016937211752E-05)]
         public void UpliftProbability_DifferentInputs_ReturnsExpectedValue(int norm, double factorOfSafety, double expectedResult)
         {
             // Setup
@@ -36,10 +36,10 @@
         }
 
         [Test]
-        [TestCase(30000, 0.6, 1 / 0.000233011)]
-        [TestCase(30000, 0.4, 1 / 0.003967252)]
-        [TestCase(20000, 0.6, 1 / 0.000292194)]
-        [TestCase(20000, 0.4, 1 / 0.004742775)]
+        [TestCase(30000, 0.6, 1/0.000233011)]
+        [TestCase(30000, 0.4, 1/0.003967252)]
+        [TestCase(20000, 0.6, 1/0.000292194)]
+        [TestCase(20000, 0.4, 1/0.004742775)]
         public void HeaveProbability_DifferentInputs_ReturnsExpectedValue(int norm, double factorOfSafety, double expectedResult)
         {
             // Setup
@@ -61,10 +61,10 @@
         }
 
         [Test]
-        [TestCase(30000, 0.9, 1 / 1.0988217217028E-05)]
-        [TestCase(30000, 0.6, 1 / 8.22098269097995E-04)]
-        [TestCase(20000, 0.9, 1 / 1.80799783465546E-05)]
-        [TestCase(20000, 0.6, 1 / 1.20312928722076E-03)]
+        [TestCase(30000, 0.9, 1/1.0988217217028E-05)]
+        [TestCase(30000, 0.6, 1/8.22098269097995E-04)]
+        [TestCase(20000, 0.9, 1/1.80799783465546E-05)]
+        [TestCase(20000, 0.6, 1/1.20312928722076E-03)]
         public void SellmeijerProbability_DifferentInputs_ReturnsExpectedValue(int norm, double factorOfSafety, double expectedResult)
         {
             // Setup
@@ -160,7 +160,7 @@
 
             var calculation = AsPipingCalculation(calculatorResult, pipingInput);
 
-            PipingSemiProbabilisticCalculationService.Calculate(calculation); 
+            PipingSemiProbabilisticCalculationService.Calculate(calculation);
 
             // Call
             RoundedDouble result = calculation.SemiProbabilisticOutput.PipingFactorOfSafety;
@@ -190,13 +190,13 @@
 
             var calculation = AsPipingCalculation(calculatorResult, pipingInput);
 
-            PipingSemiProbabilisticCalculationService.Calculate(calculation); 
+            PipingSemiProbabilisticCalculationService.Calculate(calculation);
 
             // Call
             RoundedDouble result = calculation.SemiProbabilisticOutput.PipingFactorOfSafety;
 
             // Assert
-            Assert.AreEqual(calculation.SemiProbabilisticOutput.RequiredReliability / calculation.SemiProbabilisticOutput.PipingReliability, result, result.GetAccuracy());
+            Assert.AreEqual(calculation.SemiProbabilisticOutput.RequiredReliability/calculation.SemiProbabilisticOutput.PipingReliability, result, result.GetAccuracy());
         }
 
         [Test]
@@ -235,7 +235,7 @@
             TestDelegate test = () => PipingSemiProbabilisticCalculationService.Calculate(pipingCalculation);
 
             // Assert
-            TestHelper.AssertThrowsArgumentExceptionAndTestMessage<ArgumentException>(test, "Cannot perform a semi-probabilistic calculation without output form the piping kernel.");
+            TestHelper.AssertThrowsArgumentExceptionAndTestMessage<ArgumentException>(test, "Cannot perform a semi-probabilistic calculation without output from the piping kernel.");
         }
 
         private PipingCalculation AsPipingCalculation(PipingOutput pipingOutput, NormProbabilityPipingInput normProbabilityPipingInput)