Index: Riskeer/StabilityPointStructures/test/Riskeer.StabilityPointStructures.Forms.Test/PropertyClasses/StabilityPointStructuresCalculationsPropertiesTest.cs
===================================================================
diff -u -r3d113e20211791ee77497b915bf4f32ad8d4cedd -rd9a677f9a0d3da55efaba59f08983893bf86c572
--- Riskeer/StabilityPointStructures/test/Riskeer.StabilityPointStructures.Forms.Test/PropertyClasses/StabilityPointStructuresCalculationsPropertiesTest.cs	(.../StabilityPointStructuresCalculationsPropertiesTest.cs)	(revision 3d113e20211791ee77497b915bf4f32ad8d4cedd)
+++ Riskeer/StabilityPointStructures/test/Riskeer.StabilityPointStructures.Forms.Test/PropertyClasses/StabilityPointStructuresCalculationsPropertiesTest.cs	(.../StabilityPointStructuresCalculationsPropertiesTest.cs)	(revision d9a677f9a0d3da55efaba59f08983893bf86c572)
@@ -185,15 +185,10 @@
         [TestCase(0.0)]
         [TestCase(-1.0)]
         [TestCase(-20.0)]
-        public void N_InvalidValue_ThrowsArgumentOutOfRangeExceptionNoNotifications(double value)
+        public void N_InvalidValue_ThrowsArgumentOutOfRangeException(double value)
         {
             // Setup
-            var mockRepository = new MockRepository();
-            var observer = mockRepository.StrictMock<IObserver>();
-            mockRepository.ReplayAll();
-
             var failureMechanism = new StabilityPointStructuresFailureMechanism();
-            failureMechanism.Attach(observer);
 
             var properties = new StabilityPointStructuresCalculationsProperties(failureMechanism);
 
@@ -203,7 +198,6 @@
             // Assert
             const string expectedMessage = "De waarde voor 'N' moet in het bereik [1,00, 20,00] liggen.";
             TestHelper.AssertThrowsArgumentExceptionAndTestMessage<ArgumentOutOfRangeException>(Call, expectedMessage);
-            mockRepository.VerifyAll();
         }
 
         [Test]
@@ -228,6 +222,7 @@
 
             // Assert
             Assert.AreEqual(value, failureMechanism.GeneralInput.N, failureMechanism.GeneralInput.N.GetAccuracy());
+            
             mockRepository.VerifyAll();
         }
     }
Index: Riskeer/StabilityPointStructures/test/Riskeer.StabilityPointStructures.Forms.Test/PropertyClasses/StabilityPointStructuresFailureMechanismPropertiesTest.cs
===================================================================
diff -u -r68c1056ae1d2b721cd39bcb60f3fdf3213645293 -rd9a677f9a0d3da55efaba59f08983893bf86c572
--- Riskeer/StabilityPointStructures/test/Riskeer.StabilityPointStructures.Forms.Test/PropertyClasses/StabilityPointStructuresFailureMechanismPropertiesTest.cs	(.../StabilityPointStructuresFailureMechanismPropertiesTest.cs)	(revision 68c1056ae1d2b721cd39bcb60f3fdf3213645293)
+++ Riskeer/StabilityPointStructures/test/Riskeer.StabilityPointStructures.Forms.Test/PropertyClasses/StabilityPointStructuresFailureMechanismPropertiesTest.cs	(.../StabilityPointStructuresFailureMechanismPropertiesTest.cs)	(revision d9a677f9a0d3da55efaba59f08983893bf86c572)
@@ -21,9 +21,13 @@
 
 using System;
 using System.ComponentModel;
+using Core.Common.Base;
+using Core.Common.Base.Data;
+using Core.Common.TestUtil;
 using Core.Gui.PropertyBag;
 using Core.Gui.TestUtil;
 using NUnit.Framework;
+using Rhino.Mocks;
 using Riskeer.Common.Data.TestUtil;
 using Riskeer.StabilityPointStructures.Data;
 using Riskeer.StabilityPointStructures.Forms.PropertyClasses;
@@ -139,5 +143,51 @@
                                                                             "N [-]",
                                                                             "De parameter 'N' die gebruikt wordt om het lengte-effect mee te nemen in de beoordeling.");
         }
+
+        [Test]
+        [SetCulture("nl-NL")]
+        [TestCase(0.0)]
+        [TestCase(-1.0)]
+        [TestCase(-20.0)]
+        public void N_InvalidValue_ThrowsArgumentOutOfRangeException(double value)
+        {
+            // Setup
+            var failureMechanism = new StabilityPointStructuresFailureMechanism();
+
+            var properties = new StabilityPointStructuresFailureMechanismProperties(failureMechanism, new StabilityPointStructuresFailureMechanismProperties.ConstructionProperties());
+
+            // Call
+            void Call() => properties.N = (RoundedDouble) value;
+
+            // Assert
+            const string expectedMessage = "De waarde voor 'N' moet in het bereik [1,00, 20,00] liggen.";
+            TestHelper.AssertThrowsArgumentExceptionAndTestMessage<ArgumentOutOfRangeException>(Call, expectedMessage);
+        }
+
+        [Test]
+        [TestCase(1.0)]
+        [TestCase(10.0)]
+        [TestCase(20.0)]
+        public void N_SetValidValue_UpdateDataAndNotifyObservers(double value)
+        {
+            // Setup
+            var mockRepository = new MockRepository();
+            var observer = mockRepository.StrictMock<IObserver>();
+            observer.Expect(o => o.UpdateObserver());
+            mockRepository.ReplayAll();
+
+            var failureMechanism = new StabilityPointStructuresFailureMechanism();
+            failureMechanism.Attach(observer);
+
+            var properties = new StabilityPointStructuresFailureMechanismProperties(failureMechanism, new StabilityPointStructuresFailureMechanismProperties.ConstructionProperties());
+
+            // Call
+            properties.N = (RoundedDouble) value;
+
+            // Assert
+            Assert.AreEqual(value, failureMechanism.GeneralInput.N, failureMechanism.GeneralInput.N.GetAccuracy());
+
+            mockRepository.VerifyAll();
+        }
     }
 }
\ No newline at end of file
Index: Riskeer/StabilityPointStructures/test/Riskeer.StabilityPointStructures.Forms.Test/PropertyClasses/StabilityPointStructuresFailurePathPropertiesTest.cs
===================================================================
diff -u -r68c1056ae1d2b721cd39bcb60f3fdf3213645293 -rd9a677f9a0d3da55efaba59f08983893bf86c572
--- Riskeer/StabilityPointStructures/test/Riskeer.StabilityPointStructures.Forms.Test/PropertyClasses/StabilityPointStructuresFailurePathPropertiesTest.cs	(.../StabilityPointStructuresFailurePathPropertiesTest.cs)	(revision 68c1056ae1d2b721cd39bcb60f3fdf3213645293)
+++ Riskeer/StabilityPointStructures/test/Riskeer.StabilityPointStructures.Forms.Test/PropertyClasses/StabilityPointStructuresFailurePathPropertiesTest.cs	(.../StabilityPointStructuresFailurePathPropertiesTest.cs)	(revision d9a677f9a0d3da55efaba59f08983893bf86c572)
@@ -19,9 +19,14 @@
 // Stichting Deltares and remain full property of Stichting Deltares at all times.
 // All rights reserved.
 
+using System;
 using System.ComponentModel;
+using Core.Common.Base;
+using Core.Common.Base.Data;
+using Core.Common.TestUtil;
 using Core.Gui.TestUtil;
 using NUnit.Framework;
+using Rhino.Mocks;
 using Riskeer.Common.Data.TestUtil;
 using Riskeer.StabilityPointStructures.Data;
 using Riskeer.StabilityPointStructures.Forms.PropertyClasses;
@@ -109,5 +114,51 @@
                                                                             "N [-]",
                                                                             "De parameter 'N' die gebruikt wordt om het lengte-effect mee te nemen in de beoordeling.");
         }
+
+        [Test]
+        [SetCulture("nl-NL")]
+        [TestCase(0.0)]
+        [TestCase(-1.0)]
+        [TestCase(-20.0)]
+        public void N_InvalidValue_ThrowsArgumentOutOfRangeException(double value)
+        {
+            // Setup
+            var failureMechanism = new StabilityPointStructuresFailureMechanism();
+
+            var properties = new StabilityPointStructuresFailurePathProperties(failureMechanism);
+
+            // Call
+            void Call() => properties.N = (RoundedDouble) value;
+
+            // Assert
+            const string expectedMessage = "De waarde voor 'N' moet in het bereik [1,00, 20,00] liggen.";
+            TestHelper.AssertThrowsArgumentExceptionAndTestMessage<ArgumentOutOfRangeException>(Call, expectedMessage);
+        }
+
+        [Test]
+        [TestCase(1.0)]
+        [TestCase(10.0)]
+        [TestCase(20.0)]
+        public void N_SetValidValue_UpdateDataAndNotifyObservers(double value)
+        {
+            // Setup
+            var mockRepository = new MockRepository();
+            var observer = mockRepository.StrictMock<IObserver>();
+            observer.Expect(o => o.UpdateObserver());
+            mockRepository.ReplayAll();
+
+            var failureMechanism = new StabilityPointStructuresFailureMechanism();
+            failureMechanism.Attach(observer);
+
+            var properties = new StabilityPointStructuresFailurePathProperties(failureMechanism);
+
+            // Call
+            properties.N = (RoundedDouble) value;
+
+            // Assert
+            Assert.AreEqual(value, failureMechanism.GeneralInput.N, failureMechanism.GeneralInput.N.GetAccuracy());
+
+            mockRepository.VerifyAll();
+        }
     }
 }
\ No newline at end of file