Index: Ringtoets/Common/test/Ringtoets.Common.Data.Test/Structures/StructuresFailureMechanismSectionResultTest.cs
===================================================================
diff -u -r89bea52ae1b4639721b93bdd4a537f36ec6d6b9c -rb6e0f8d41d92ed18c902138dd49cce6e703ee883
--- Ringtoets/Common/test/Ringtoets.Common.Data.Test/Structures/StructuresFailureMechanismSectionResultTest.cs	(.../StructuresFailureMechanismSectionResultTest.cs)	(revision 89bea52ae1b4639721b93bdd4a537f36ec6d6b9c)
+++ Ringtoets/Common/test/Ringtoets.Common.Data.Test/Structures/StructuresFailureMechanismSectionResultTest.cs	(.../StructuresFailureMechanismSectionResultTest.cs)	(revision b6e0f8d41d92ed18c902138dd49cce6e703ee883)
@@ -19,10 +19,14 @@
 // Stichting Deltares and remain full property of Stichting Deltares at all times.
 // All rights reserved.
 
+using System;
+using Core.Common.Base.Data;
 using Core.Common.Base.Geometry;
+using Core.Common.TestUtil;
 using NUnit.Framework;
 using Ringtoets.Common.Data.FailureMechanism;
 using Ringtoets.Common.Data.Structures;
+using Ringtoets.Common.Data.TestUtil;
 
 namespace Ringtoets.Common.Data.Test.Structures
 {
@@ -41,6 +45,7 @@
             // Assert
             Assert.IsInstanceOf<StructuresFailureMechanismSectionResult<TestStructuresInput>>(sectionResult);
             Assert.IsNull(sectionResult.Calculation);
+            Assert.IsNaN(sectionResult.AssessmentLayerThree);
             Assert.AreSame(section, sectionResult.Section);
         }
 
@@ -61,6 +66,44 @@
             Assert.AreSame(calculation, result.Calculation);
         }
 
+        [Test]
+        [TestCase(double.NegativeInfinity)]
+        [TestCase(double.PositiveInfinity)]
+        [TestCase(1.1)]
+        [TestCase(-0.1)]
+        public void AssessmentLayerThree_SetInvalidValue_ThrowsArgumentOutOfRangeException(double invalidValue)
+        {
+            // Setup
+            var sectionResult = new TestStructuresFailureMechanismSectionResult(CreateSection());
+
+            // Call
+            TestDelegate call = () => sectionResult.AssessmentLayerThree = (RoundedDouble) invalidValue;
+
+            // Assert
+            const string expectedMessage = "Kans moet in het bereik [0.0, 1.0] liggen.";
+            TestHelper.AssertThrowsArgumentExceptionAndTestMessage<ArgumentOutOfRangeException>(call,
+                                                                                                expectedMessage);
+        }
+
+        [Test]
+        [TestCase(double.NaN)]
+        [TestCase(0)]
+        [TestCase(1)]
+        [TestCase(0.5)]
+        public void AssessmentLayerThree_SetValidValue_SetsValue(double validValue)
+        {
+            // Setup
+            var sectionResult = new TestStructuresFailureMechanismSectionResult(CreateSection());
+
+            // Call
+            TestDelegate call = () => sectionResult.AssessmentLayerThree = (RoundedDouble) validValue;
+
+            // Assert
+            Assert.DoesNotThrow(call);
+            Assert.AreEqual(validValue, sectionResult.AssessmentLayerThree, sectionResult.AssessmentLayerThree.GetAccuracy());
+        }
+
+
         private static FailureMechanismSection CreateSection()
         {
             return new FailureMechanismSection("Section", new[]