Index: Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.KernelWrapper/Creators/AssemblyCategoryCreator.cs
===================================================================
diff -u -recd4e132deb2683aadc0f83f0853dc1b79602033 -r3beb793b4db2bc773a4ae68783902c359db1e6bb
--- Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.KernelWrapper/Creators/AssemblyCategoryCreator.cs	(.../AssemblyCategoryCreator.cs)	(revision ecd4e132deb2683aadc0f83f0853dc1b79602033)
+++ Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.KernelWrapper/Creators/AssemblyCategoryCreator.cs	(.../AssemblyCategoryCreator.cs)	(revision 3beb793b4db2bc773a4ae68783902c359db1e6bb)
@@ -60,7 +60,7 @@
                 categoriesOutput => new AssessmentSectionAssemblyCategory(
                     categoriesOutput.LowerLimit,
                     categoriesOutput.UpperLimit,
-                    ConvertAssessmentSectionCategoryGroup(categoriesOutput.Category))).ToArray();
+                    CreateAssessmentSectionAssemblyCategory(categoriesOutput.Category))).ToArray();
         }
 
         /// <summary>
@@ -92,15 +92,15 @@
         }
 
         /// <summary>
-        /// Converts a <see cref="EAssessmentGrade"/> into a <see cref="AssessmentSectionAssemblyCategoryGroup"/>.
+        /// Creates a <see cref="AssessmentSectionAssemblyCategoryGroup"/> based on <paramref name="category"/>.
         /// </summary>
         /// <param name="category">The <see cref="EAssessmentGrade"/> to convert.</param>
         /// <returns>A <see cref="AssessmentSectionAssemblyCategoryGroup"/> based on <paramref name="category"/>.</returns>
         /// <exception cref="InvalidEnumArgumentException">Thrown when <paramref name="category"/>
         /// is an invalid value.</exception>
         /// <exception cref="NotSupportedException">Thrown when <paramref name="category"/>
         /// is a valid value, but unsupported.</exception>
-        private static AssessmentSectionAssemblyCategoryGroup ConvertAssessmentSectionCategoryGroup(EAssessmentGrade category)
+        public static AssessmentSectionAssemblyCategoryGroup CreateAssessmentSectionAssemblyCategory(EAssessmentGrade category)
         {
             if (!Enum.IsDefined(typeof(EAssessmentGrade), category))
             {
Index: Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.KernelWrapper/Creators/AssessmentSectionAssemblyCreator.cs
===================================================================
diff -u
--- Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.KernelWrapper/Creators/AssessmentSectionAssemblyCreator.cs	(revision 0)
+++ Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.KernelWrapper/Creators/AssessmentSectionAssemblyCreator.cs	(revision 3beb793b4db2bc773a4ae68783902c359db1e6bb)
@@ -0,0 +1,56 @@
+// Copyright (C) Stichting Deltares 2017. 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 System;
+using System.ComponentModel;
+using Assembly.Kernel.Model;
+using Ringtoets.AssemblyTool.Data;
+
+namespace Ringtoets.AssemblyTool.KernelWrapper.Creators
+{
+    /// <summary>
+    /// Creates <see cref="AssessmentSectionAssembly"/> instances and 
+    /// <see cref="AssessmentSectionAssemblyCategoryGroup"/> values.
+    /// </summary>
+    internal static class AssessmentSectionAssemblyCreator
+    {
+        /// <summary>
+        /// Creates <see cref="AssessmentSectionAssembly"/> from the given <see cref="AssessmentSectionAssemblyResult"/>.
+        /// </summary>
+        /// <param name="result">The result to create the assembly from.</param>
+        /// <returns>The created assembly.</returns>
+        /// <exception cref="ArgumentNullException">Thrown when <paramref name="result"/> is <c>null</c>.</exception>
+        /// <exception cref="InvalidEnumArgumentException">Thrown when <see cref="EAssessmentGrade"/>
+        /// is an invalid value.</exception>
+        /// <exception cref="NotSupportedException">Thrown when <see cref="EAssessmentGrade"/>
+        /// is a valid value, but unsupported.</exception>
+        public static AssessmentSectionAssembly CreateAssessmentSectionAssembly(AssessmentSectionAssemblyResult result)
+        {
+            if (result == null)
+            {
+                throw new ArgumentNullException(nameof(result));
+            }
+
+            return new AssessmentSectionAssembly(result.FailureProbability ?? double.NaN,
+                                                 AssemblyCategoryCreator.CreateAssessmentSectionAssemblyCategory(result.Category));
+        }
+    }
+}
\ No newline at end of file
Index: Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.KernelWrapper/Ringtoets.AssemblyTool.KernelWrapper.csproj
===================================================================
diff -u -r73961743fdbd1f57320393a37d4b551dc56ff47d -r3beb793b4db2bc773a4ae68783902c359db1e6bb
--- Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.KernelWrapper/Ringtoets.AssemblyTool.KernelWrapper.csproj	(.../Ringtoets.AssemblyTool.KernelWrapper.csproj)	(revision 73961743fdbd1f57320393a37d4b551dc56ff47d)
+++ Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.KernelWrapper/Ringtoets.AssemblyTool.KernelWrapper.csproj	(.../Ringtoets.AssemblyTool.KernelWrapper.csproj)	(revision 3beb793b4db2bc773a4ae68783902c359db1e6bb)
@@ -28,6 +28,7 @@
     <Compile Include="Calculators\Categories\IAssemblyCategoriesCalculator.cs" />
     <Compile Include="Calculators\IAssemblyToolCalculatorFactory.cs" />
     <Compile Include="Creators\AssemblyCategoryCreator.cs" />
+    <Compile Include="Creators\AssessmentSectionAssemblyCreator.cs" />
     <Compile Include="Creators\AssessmentSectionAssemblyInputCreator.cs" />
     <Compile Include="Creators\FailureMechanismSectionAssemblyCalculatorInputCreator.cs" />
     <Compile Include="Creators\FailureMechanismAssemblyCreator.cs" />
Index: Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.KernelWrapper.Test/Creators/AssemblyCategoryCreatorTest.cs
===================================================================
diff -u -r9a64bbb28b8179b5894b4bbaf418330a974bf36b -r3beb793b4db2bc773a4ae68783902c359db1e6bb
--- Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.KernelWrapper.Test/Creators/AssemblyCategoryCreatorTest.cs	(.../AssemblyCategoryCreatorTest.cs)	(revision 9a64bbb28b8179b5894b4bbaf418330a974bf36b)
+++ Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.KernelWrapper.Test/Creators/AssemblyCategoryCreatorTest.cs	(.../AssemblyCategoryCreatorTest.cs)	(revision 3beb793b4db2bc773a4ae68783902c359db1e6bb)
@@ -37,6 +37,21 @@
     [TestFixture]
     public class AssemblyCategoryCreatorTest
     {
+        private static IEnumerable<TestCaseData> GetAssessmentSectionAssemblyCategoryGroupConversions
+        {
+            get
+            {
+                yield return new TestCaseData(EAssessmentGrade.APlus, AssessmentSectionAssemblyCategoryGroup.APlus);
+                yield return new TestCaseData(EAssessmentGrade.A, AssessmentSectionAssemblyCategoryGroup.A);
+                yield return new TestCaseData(EAssessmentGrade.B, AssessmentSectionAssemblyCategoryGroup.B);
+                yield return new TestCaseData(EAssessmentGrade.C, AssessmentSectionAssemblyCategoryGroup.C);
+                yield return new TestCaseData(EAssessmentGrade.D, AssessmentSectionAssemblyCategoryGroup.D);
+                yield return new TestCaseData(EAssessmentGrade.Gr, AssessmentSectionAssemblyCategoryGroup.None);
+                yield return new TestCaseData(EAssessmentGrade.Nvt, AssessmentSectionAssemblyCategoryGroup.NotApplicable);
+                yield return new TestCaseData(EAssessmentGrade.Ngo, AssessmentSectionAssemblyCategoryGroup.NotAssessed);
+            }
+        }
+
         [Test]
         public void CreateAssessmentSectionAssemblyCategories_CategoryLimitsNull_ThrowsArgumentNullException()
         {
@@ -87,14 +102,7 @@
         }
 
         [Test]
-        [TestCase(EAssessmentGrade.APlus, AssessmentSectionAssemblyCategoryGroup.APlus)]
-        [TestCase(EAssessmentGrade.A, AssessmentSectionAssemblyCategoryGroup.A)]
-        [TestCase(EAssessmentGrade.B, AssessmentSectionAssemblyCategoryGroup.B)]
-        [TestCase(EAssessmentGrade.C, AssessmentSectionAssemblyCategoryGroup.C)]
-        [TestCase(EAssessmentGrade.D, AssessmentSectionAssemblyCategoryGroup.D)]
-        [TestCase(EAssessmentGrade.Gr, AssessmentSectionAssemblyCategoryGroup.None)]
-        [TestCase(EAssessmentGrade.Nvt, AssessmentSectionAssemblyCategoryGroup.NotApplicable)]
-        [TestCase(EAssessmentGrade.Ngo, AssessmentSectionAssemblyCategoryGroup.NotAssessed)]
+        [TestCaseSource(nameof(GetAssessmentSectionAssemblyCategoryGroupConversions))]
         public void CreateAssessmentSectionAssemblyCategories_CategoryWithValidAssessmentGrade_ExpectedAssessmentSectionAssemblyCategoryResultType(
             EAssessmentGrade categoryGroup,
             AssessmentSectionAssemblyCategoryGroup expectedCategoryGroup)
@@ -115,6 +123,36 @@
         }
 
         [Test]
+        public void CreateAssessmentSectionAssemblyCategoryGroup_WithInvalidAssessmentGrade_ThrowsInvalidEnumArgumentException()
+        {
+            // Setup
+            var categoryLimits = new[]
+            {
+                new AssessmentSectionCategoryLimits((EAssessmentGrade) 99, 0, 0)
+            };
+
+            // Call
+            TestDelegate test = () => AssemblyCategoryCreator.CreateAssessmentSectionAssemblyCategory((EAssessmentGrade)99);
+
+            // Assert
+            const string exceptionMessage = "The value of argument 'category' (99) is invalid for Enum type 'EAssessmentGrade'.";
+            TestHelper.AssertThrowsArgumentExceptionAndTestMessage<InvalidEnumArgumentException>(test, exceptionMessage);
+        }
+
+        [Test]
+        [TestCaseSource(nameof(GetAssessmentSectionAssemblyCategoryGroupConversions))]
+        public void CreateAssessmentSectionAssemblyCategory_WithValidAssessmentGrade_ExpectedAssessmentSectionAssemblyCategoryResultType(
+            EAssessmentGrade categoryGroup,
+            AssessmentSectionAssemblyCategoryGroup expectedCategoryGroup)
+        {
+            // Call
+            AssessmentSectionAssemblyCategoryGroup categoryResult = AssemblyCategoryCreator.CreateAssessmentSectionAssemblyCategory(categoryGroup);
+
+            // Assert
+            Assert.AreEqual(expectedCategoryGroup, categoryResult);
+        }
+
+        [Test]
         public void CreateFailureMechanismSectionAssemblyCategories_CategoryLimitsNull_ThrowsArgumentNullException()
         {
             // Call
Index: Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.KernelWrapper.Test/Creators/AssessmentSectionAssemblyCreatorTest.cs
===================================================================
diff -u
--- Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.KernelWrapper.Test/Creators/AssessmentSectionAssemblyCreatorTest.cs	(revision 0)
+++ Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.KernelWrapper.Test/Creators/AssessmentSectionAssemblyCreatorTest.cs	(revision 3beb793b4db2bc773a4ae68783902c359db1e6bb)
@@ -0,0 +1,86 @@
+// Copyright (C) Stichting Deltares 2017. 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 System;
+using System.ComponentModel;
+using Assembly.Kernel.Model;
+using Core.Common.TestUtil;
+using NUnit.Framework;
+using Ringtoets.AssemblyTool.Data;
+using Ringtoets.AssemblyTool.KernelWrapper.Creators;
+
+namespace Ringtoets.AssemblyTool.KernelWrapper.Test.Creators
+{
+    [TestFixture]
+    public class AssessmentSectionAssemblyCreatorTest
+    {
+        [Test]
+        public void CreateAssessmentSectionAssemblyWithProbability_ResultNull_ThrowsArgumentNullException()
+        {
+            // Call
+            TestDelegate call = () => AssessmentSectionAssemblyCreator.CreateAssessmentSectionAssembly(null);
+
+            // Assert
+            var exception = Assert.Throws<ArgumentNullException>(call);
+            Assert.AreEqual("result", exception.ParamName);
+        }
+
+        [Test]
+        public void CreateAssessmentSectionAssemblyWithProbability_WithInvalidEnum_ThrowsInvalidEnumArgumentException()
+        {
+            // Setup
+            var random = new Random(21);
+            var assemblyResult = new AssessmentSectionAssemblyResult((EAssessmentGrade) 99, random.NextDouble());
+
+            // Call
+            TestDelegate test = () => AssessmentSectionAssemblyCreator.CreateAssessmentSectionAssembly(assemblyResult);
+
+            // Assert
+            const string exceptionMessage = "The value of argument 'category' (99) is invalid for Enum type 'EAssessmentGrade'.";
+            TestHelper.AssertThrowsArgumentExceptionAndTestMessage<InvalidEnumArgumentException>(test, exceptionMessage);
+        }
+
+        [Test]
+        [TestCase(EAssessmentGrade.APlus, AssessmentSectionAssemblyCategoryGroup.APlus)]
+        [TestCase(EAssessmentGrade.A, AssessmentSectionAssemblyCategoryGroup.A)]
+        [TestCase(EAssessmentGrade.B, AssessmentSectionAssemblyCategoryGroup.B)]
+        [TestCase(EAssessmentGrade.C, AssessmentSectionAssemblyCategoryGroup.C)]
+        [TestCase(EAssessmentGrade.D, AssessmentSectionAssemblyCategoryGroup.D)]
+        [TestCase(EAssessmentGrade.Gr, AssessmentSectionAssemblyCategoryGroup.None)]
+        [TestCase(EAssessmentGrade.Nvt, AssessmentSectionAssemblyCategoryGroup.NotApplicable)]
+        [TestCase(EAssessmentGrade.Ngo, AssessmentSectionAssemblyCategoryGroup.NotAssessed)]
+        public void CreateAssessmentSectionAssemblyWithProbability_WithValidEnum_ReturnsExpectedValues(EAssessmentGrade originalGroup,
+                                                                                                       AssessmentSectionAssemblyCategoryGroup expectedGroup)
+        {
+            // Setup
+            var random = new Random(21);
+            double probability = random.NextDouble();
+            var assemblyResult = new AssessmentSectionAssemblyResult(originalGroup, probability);
+
+            // Call
+            AssessmentSectionAssembly result = AssessmentSectionAssemblyCreator.CreateAssessmentSectionAssembly(assemblyResult);
+
+            // Assert
+            Assert.AreEqual(probability, result.Probability);
+            Assert.AreEqual(expectedGroup, result.Group);
+        }
+    }
+}
\ No newline at end of file
Index: Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.KernelWrapper.Test/Ringtoets.AssemblyTool.KernelWrapper.Test.csproj
===================================================================
diff -u -r73961743fdbd1f57320393a37d4b551dc56ff47d -r3beb793b4db2bc773a4ae68783902c359db1e6bb
--- Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.KernelWrapper.Test/Ringtoets.AssemblyTool.KernelWrapper.Test.csproj	(.../Ringtoets.AssemblyTool.KernelWrapper.Test.csproj)	(revision 73961743fdbd1f57320393a37d4b551dc56ff47d)
+++ Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.KernelWrapper.Test/Ringtoets.AssemblyTool.KernelWrapper.Test.csproj	(.../Ringtoets.AssemblyTool.KernelWrapper.Test.csproj)	(revision 3beb793b4db2bc773a4ae68783902c359db1e6bb)
@@ -30,6 +30,7 @@
     <Compile Include="Calculators\Categories\AssemblyCategoriesCalculatorExceptionTest.cs" />
     <Compile Include="Calculators\Categories\AssemblyCategoriesCalculatorTest.cs" />
     <Compile Include="Creators\AssemblyCategoryCreatorTest.cs" />
+    <Compile Include="Creators\AssessmentSectionAssemblyCreatorTest.cs" />
     <Compile Include="Creators\AssessmentSectionAssemblyInputCreatorTest.cs" />
     <Compile Include="Creators\FailureMechanismSectionAssemblyCalculatorInputCreatorTest.cs" />
     <Compile Include="Creators\FailureMechanismAssemblyCreatorTest.cs" />