Index: Ringtoets/StabilityPointStructures/src/Ringtoets.StabilityPointStructures.Data/StabilityPointStructuresFailureMechanism.cs
===================================================================
diff -u -r421cbbc8a7149960b5e6908bde1744c63e4d1169 -rffbaaa780dcc561261a6030e315f50d198d5470b
--- Ringtoets/StabilityPointStructures/src/Ringtoets.StabilityPointStructures.Data/StabilityPointStructuresFailureMechanism.cs	(.../StabilityPointStructuresFailureMechanism.cs)	(revision 421cbbc8a7149960b5e6908bde1744c63e4d1169)
+++ Ringtoets/StabilityPointStructures/src/Ringtoets.StabilityPointStructures.Data/StabilityPointStructuresFailureMechanism.cs	(.../StabilityPointStructuresFailureMechanism.cs)	(revision ffbaaa780dcc561261a6030e315f50d198d5470b)
@@ -94,14 +94,15 @@
         public override void AddSection(FailureMechanismSection section)
         {
             base.AddSection(section);
-
             sectionResults.Add(new StructuresFailureMechanismSectionResult<StabilityPointStructuresInput>(section));
+            sectionResults.NotifyObservers();
         }
 
         public override void ClearAllSections()
         {
             base.ClearAllSections();
             sectionResults.Clear();
+            sectionResults.NotifyObservers();
         }
     }
 }
\ No newline at end of file
Index: Ringtoets/StabilityPointStructures/test/Ringtoets.StabilityPointStructures.Data.Test/StabilityPointStructuresFailureMechanismTest.cs
===================================================================
diff -u -r56246f10e7876b30f36a5b9709ec2e3332b4010a -rffbaaa780dcc561261a6030e315f50d198d5470b
--- Ringtoets/StabilityPointStructures/test/Ringtoets.StabilityPointStructures.Data.Test/StabilityPointStructuresFailureMechanismTest.cs	(.../StabilityPointStructuresFailureMechanismTest.cs)	(revision 56246f10e7876b30f36a5b9709ec2e3332b4010a)
+++ Ringtoets/StabilityPointStructures/test/Ringtoets.StabilityPointStructures.Data.Test/StabilityPointStructuresFailureMechanismTest.cs	(.../StabilityPointStructuresFailureMechanismTest.cs)	(revision ffbaaa780dcc561261a6030e315f50d198d5470b)
@@ -21,6 +21,7 @@
 
 using System.Collections.Generic;
 using System.Linq;
+using Core.Common.Base;
 using Core.Common.Base.Geometry;
 using NUnit.Framework;
 using Rhino.Mocks;
@@ -57,26 +58,39 @@
         }
 
         [Test]
-        public void AddSection_WithSection_AddedStabilityPointStructuresFailureMechanismSectionResult()
+        public void AddSection_WithSection_AddedSectionResultAndNotifiesObserver()
         {
             // Setup
+            var mocks = new MockRepository();
+            var observer = mocks.StrictMock<IObserver>();
+            observer.Expect(o => o.UpdateObserver());
+            mocks.ReplayAll();
+
             var failureMechanism = new StabilityPointStructuresFailureMechanism();
+            failureMechanism.SectionResults.Attach(observer);
 
             // Call
-            failureMechanism.AddSection(new FailureMechanismSection("", new[]
+            failureMechanism.AddSection(new FailureMechanismSection(string.Empty, new[]
             {
                 new Point2D(2, 1)
             }));
 
             // Assert
+            Assert.AreEqual(1, failureMechanism.Sections.Count());
             Assert.AreEqual(1, failureMechanism.SectionResults.Count());
             Assert.IsInstanceOf<StructuresFailureMechanismSectionResult<StabilityPointStructuresInput>>(failureMechanism.SectionResults.ElementAt(0));
+            mocks.VerifyAll();
         }
 
         [Test]
-        public void ClearAllSections_WithSectionsAndSectionResults_SectionsAndSectionResultsCleared()
+        public void ClearAllSections_WithSectionsAndSectionResults_SectionsAndSectionResultsClearedAndNotifiesObserver()
         {
             // Setup
+            var mocks = new MockRepository();
+            var observer = mocks.StrictMock<IObserver>();
+            observer.Expect(o => o.UpdateObserver());
+            mocks.ReplayAll();
+
             var failureMechanism = new StabilityPointStructuresFailureMechanism();
 
             failureMechanism.AddSection(new FailureMechanismSection("", new[]
@@ -88,6 +102,8 @@
                 new Point2D(2, 1)
             }));
 
+            failureMechanism.SectionResults.Attach(observer);
+
             // Precondition
             Assert.AreEqual(2, failureMechanism.Sections.Count());
             Assert.AreEqual(2, failureMechanism.SectionResults.Count());
@@ -98,6 +114,7 @@
             // Assert
             Assert.AreEqual(0, failureMechanism.Sections.Count());
             Assert.AreEqual(0, failureMechanism.SectionResults.Count());
+            mocks.VerifyAll();
         }
 
         [Test]