Index: Ringtoets/Integration/src/Ringtoets.Integration.Data/StandAlone/MicrostabilityFailureMechanism.cs
===================================================================
diff -u -r421cbbc8a7149960b5e6908bde1744c63e4d1169 -r29acf1af7ae26a676006ef5ba182f3ba71b80a8d
--- Ringtoets/Integration/src/Ringtoets.Integration.Data/StandAlone/MicrostabilityFailureMechanism.cs	(.../MicrostabilityFailureMechanism.cs)	(revision 421cbbc8a7149960b5e6908bde1744c63e4d1169)
+++ Ringtoets/Integration/src/Ringtoets.Integration.Data/StandAlone/MicrostabilityFailureMechanism.cs	(.../MicrostabilityFailureMechanism.cs)	(revision 29acf1af7ae26a676006ef5ba182f3ba71b80a8d)
@@ -65,12 +65,14 @@
         {
             base.AddSection(section);
             sectionResults.Add(new MicrostabilityFailureMechanismSectionResult(section));
+            sectionResults.NotifyObservers();
         }
 
         public override void ClearAllSections()
         {
             base.ClearAllSections();
             sectionResults.Clear();
+            sectionResults.NotifyObservers();
         }
     }
 }
\ No newline at end of file
Index: Ringtoets/Integration/test/Ringtoets.Integration.Data.Test/StandAlone/MicrostabilityFailureMechanismTest.cs
===================================================================
diff -u -r802ea30d1fe8fbae93e58dff9ab054dbabca11ae -r29acf1af7ae26a676006ef5ba182f3ba71b80a8d
--- Ringtoets/Integration/test/Ringtoets.Integration.Data.Test/StandAlone/MicrostabilityFailureMechanismTest.cs	(.../MicrostabilityFailureMechanismTest.cs)	(revision 802ea30d1fe8fbae93e58dff9ab054dbabca11ae)
+++ Ringtoets/Integration/test/Ringtoets.Integration.Data.Test/StandAlone/MicrostabilityFailureMechanismTest.cs	(.../MicrostabilityFailureMechanismTest.cs)	(revision 29acf1af7ae26a676006ef5ba182f3ba71b80a8d)
@@ -20,8 +20,10 @@
 // All rights reserved.
 
 using System.Linq;
+using Core.Common.Base;
 using Core.Common.Base.Geometry;
 using NUnit.Framework;
+using Rhino.Mocks;
 using Ringtoets.Common.Data.FailureMechanism;
 using Ringtoets.Integration.Data.StandAlone;
 using Ringtoets.Integration.Data.StandAlone.SectionResults;
@@ -45,20 +47,63 @@
         }
 
         [Test]
-        public void AddSection_WithSection_AddedMicrostabilityFailureMechanismSectionResult()
+        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 MicrostabilityFailureMechanism();
+            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<MicrostabilityFailureMechanismSectionResult>(failureMechanism.SectionResults.ElementAt(0));
+            mocks.VerifyAll();
         }
+
+        [Test]
+        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 MicrostabilityFailureMechanism();
+
+            failureMechanism.AddSection(new FailureMechanismSection("", new[]
+            {
+                new Point2D(2, 1)
+            }));
+            failureMechanism.AddSection(new FailureMechanismSection("", new[]
+            {
+                new Point2D(2, 1)
+            }));
+
+            failureMechanism.SectionResults.Attach(observer);
+
+            // Precondition
+            Assert.AreEqual(2, failureMechanism.Sections.Count());
+            Assert.AreEqual(2, failureMechanism.SectionResults.Count());
+
+            // Call
+            failureMechanism.ClearAllSections();
+
+            // Assert
+            Assert.AreEqual(0, failureMechanism.Sections.Count());
+            Assert.AreEqual(0, failureMechanism.SectionResults.Count());
+            mocks.ReplayAll();
+        }
     }
 }
\ No newline at end of file