Index: Ringtoets/DuneErosion/src/Ringtoets.DuneErosion.Forms/PropertyClasses/DuneErosionFailureMechanismProperties.cs
===================================================================
diff -u -r6ac1d016e76120e778964de3ad7e2c0d6c837669 -r44e9772bc7d234fe16a3e00fc23c155f7ee81d20
--- Ringtoets/DuneErosion/src/Ringtoets.DuneErosion.Forms/PropertyClasses/DuneErosionFailureMechanismProperties.cs	(.../DuneErosionFailureMechanismProperties.cs)	(revision 6ac1d016e76120e778964de3ad7e2c0d6c837669)
+++ Ringtoets/DuneErosion/src/Ringtoets.DuneErosion.Forms/PropertyClasses/DuneErosionFailureMechanismProperties.cs	(.../DuneErosionFailureMechanismProperties.cs)	(revision 44e9772bc7d234fe16a3e00fc23c155f7ee81d20)
@@ -39,8 +39,9 @@
     {
         private const int namePropertyIndex = 1;
         private const int codePropertyIndex = 2;
-        private const int isRelevantPropertyIndex = 3;
-        private const int nPropertyIndex = 4;
+        private const int contributionPropertyIndex = 3;
+        private const int isRelevantPropertyIndex = 4;
+        private const int nPropertyIndex = 5;
         private readonly IFailureMechanismPropertyChangeHandler<DuneErosionFailureMechanism> propertyChangeHandler;
 
         /// <summary>
@@ -111,7 +112,7 @@
 
         private bool ShouldHidePropertyWhenFailureMechanismIrrelevant(string propertyName)
         {
-            return nameof(N).Equals(propertyName);
+            return nameof(Contribution).Equals(propertyName) || nameof(N).Equals(propertyName);
         }
 
         #region General
@@ -140,6 +141,19 @@
             }
         }
 
+        [DynamicVisible]
+        [PropertyOrder(contributionPropertyIndex)]
+        [ResourcesCategory(typeof(RingtoetsCommonFormsResources), nameof(RingtoetsCommonFormsResources.Categories_General))]
+        [ResourcesDisplayName(typeof(RingtoetsCommonFormsResources), nameof(RingtoetsCommonFormsResources.FailureMechanism_Contribution_DisplayName))]
+        [ResourcesDescription(typeof(RingtoetsCommonFormsResources), nameof(RingtoetsCommonFormsResources.FailureMechanism_Contribution_Description))]
+        public double Contribution
+        {
+            get
+            {
+                return data.Contribution;
+            }
+        }
+
         [PropertyOrder(isRelevantPropertyIndex)]
         [ResourcesCategory(typeof(RingtoetsCommonFormsResources), nameof(RingtoetsCommonFormsResources.Categories_General))]
         [ResourcesDisplayName(typeof(RingtoetsCommonFormsResources), nameof(RingtoetsCommonFormsResources.FailureMechanism_IsRelevant_DisplayName))]
Index: Ringtoets/DuneErosion/test/Ringtoets.DuneErosion.Forms.Test/PropertyClasses/DuneErosionFailureMechanismPropertiesTest.cs
===================================================================
diff -u -r98544d1ded83f880238cb8e69f77b58ec1dbcc19 -r44e9772bc7d234fe16a3e00fc23c155f7ee81d20
--- Ringtoets/DuneErosion/test/Ringtoets.DuneErosion.Forms.Test/PropertyClasses/DuneErosionFailureMechanismPropertiesTest.cs	(.../DuneErosionFailureMechanismPropertiesTest.cs)	(revision 98544d1ded83f880238cb8e69f77b58ec1dbcc19)
+++ Ringtoets/DuneErosion/test/Ringtoets.DuneErosion.Forms.Test/PropertyClasses/DuneErosionFailureMechanismPropertiesTest.cs	(.../DuneErosionFailureMechanismPropertiesTest.cs)	(revision 44e9772bc7d234fe16a3e00fc23c155f7ee81d20)
@@ -40,25 +40,37 @@
     {
         private const int namePropertyIndex = 0;
         private const int codePropertyIndex = 1;
-        private const int isRelevantPropertyIndex = 2;
-        private const int nPropertyIndex = 3;
+        private const int contributionPropertyIndex = 2;
+        private const int isRelevantPropertyIndex = 3;
+        private const int nPropertyIndex = 4;
 
         [Test]
-        public void Constructor_ExpectedValues()
+        [TestCase(true)]
+        [TestCase(false)]
+        public void Constructor_ExpectedValues(bool isRelevant)
         {
             // Setup
             var mocks = new MockRepository();
             var changeHandler = mocks.Stub<IFailureMechanismPropertyChangeHandler<DuneErosionFailureMechanism>>();
             mocks.ReplayAll();
 
-            var failureMechanism = new DuneErosionFailureMechanism();
+            var failureMechanism = new DuneErosionFailureMechanism
+            {
+                IsRelevant = isRelevant
+            };
 
             // Call
             var properties = new DuneErosionFailureMechanismProperties(failureMechanism, changeHandler);
 
             // Assert
             Assert.IsInstanceOf<ObjectProperties<DuneErosionFailureMechanism>>(properties);
             Assert.AreSame(failureMechanism, properties.Data);
+            Assert.AreEqual(failureMechanism.Name, properties.Name);
+            Assert.AreEqual(failureMechanism.Code, properties.Code);
+            Assert.AreEqual(failureMechanism.Contribution, properties.Contribution);
+            Assert.AreEqual(isRelevant, properties.IsRelevant);
+
+            Assert.AreEqual(failureMechanism.GeneralInput.N, properties.N);
             mocks.VerifyAll();
         }
 
@@ -111,7 +123,7 @@
 
             // Assert
             PropertyDescriptorCollection dynamicProperties = PropertiesTestHelper.GetAllVisiblePropertyDescriptors(properties);
-            Assert.AreEqual(4, dynamicProperties.Count);
+            Assert.AreEqual(5, dynamicProperties.Count);
 
             const string generalCategory = "Algemeen";
             const string lengthEffectParameterCategory = "Lengte-effect parameters";
@@ -130,6 +142,13 @@
                                                                             "Het label van het toetsspoor.",
                                                                             true);
 
+            PropertyDescriptor contributionProperty = dynamicProperties[contributionPropertyIndex];
+            PropertiesTestHelper.AssertRequiredPropertyDescriptorProperties(contributionProperty,
+                                                                            generalCategory,
+                                                                            "Faalkansbijdrage [%]",
+                                                                            "Procentuele bijdrage van dit toetsspoor aan de totale overstromingskans van het traject.",
+                                                                            true);
+
             PropertyDescriptor isRelevantProperty = dynamicProperties[isRelevantPropertyIndex];
             PropertiesTestHelper.AssertRequiredPropertyDescriptorProperties(isRelevantProperty,
                                                                             generalCategory,
@@ -181,7 +200,7 @@
                                                                             "Het label van het toetsspoor.",
                                                                             true);
 
-            PropertyDescriptor isRelevantProperty = dynamicProperties[isRelevantPropertyIndex];
+            PropertyDescriptor isRelevantProperty = dynamicProperties[isRelevantPropertyIndex - 1];
             PropertiesTestHelper.AssertRequiredPropertyDescriptorProperties(isRelevantProperty,
                                                                             generalCategory,
                                                                             "Is relevant",
@@ -191,43 +210,6 @@
         }
 
         [Test]
-        [TestCase(true)]
-        [TestCase(false)]
-        public void Data_SetNewFailureMechanismContext_ReturnCorrectPropertyValues(bool isRelevant)
-        {
-            // Setup
-            var mocks = new MockRepository();
-            var changeHandler = mocks.Stub<IFailureMechanismPropertyChangeHandler<DuneErosionFailureMechanism>>();
-            mocks.ReplayAll();
-
-            var originalFailureMechanism = new DuneErosionFailureMechanism
-            {
-                IsRelevant = !isRelevant,
-                GeneralInput =
-                {
-                    N = (RoundedDouble) 1.1
-                }
-            };
-
-            var failureMechanism = new DuneErosionFailureMechanism
-            {
-                IsRelevant = isRelevant
-            };
-
-            var properties = new DuneErosionFailureMechanismProperties(originalFailureMechanism, changeHandler);
-
-            // Call
-            properties.Data = failureMechanism;
-
-            // Assert
-            Assert.AreEqual("Duinwaterkering - Duinafslag", properties.Name);
-            Assert.AreEqual("DA", properties.Code);
-            Assert.AreEqual(isRelevant, properties.IsRelevant);
-            Assert.AreEqual(failureMechanism.GeneralInput.N, properties.N);
-            mocks.VerifyAll();
-        }
-
-        [Test]
         [SetCulture("nl-NL")]
         [TestCase(0.0)]
         [TestCase(-1.0)]
@@ -314,6 +296,7 @@
             Assert.IsTrue(properties.DynamicVisibleValidationMethod(nameof(properties.Code)));
             Assert.IsTrue(properties.DynamicVisibleValidationMethod(nameof(properties.IsRelevant)));
 
+            Assert.AreEqual(isRelevant, properties.DynamicVisibleValidationMethod(nameof(properties.Contribution)));
             Assert.AreEqual(isRelevant, properties.DynamicVisibleValidationMethod(nameof(properties.N)));
 
             Assert.IsTrue(properties.DynamicVisibleValidationMethod(null));