Index: Riskeer/Piping/src/Riskeer.Piping.Data/PipingScenarioConfigurationPerFailureMechanismSection.cs
===================================================================
diff -u -r3cf6af4f03c576c365448e0af315d58bf8217c7c -rd9334d0a89e1271b4288b132c3148b539f3b0d22
--- Riskeer/Piping/src/Riskeer.Piping.Data/PipingScenarioConfigurationPerFailureMechanismSection.cs	(.../PipingScenarioConfigurationPerFailureMechanismSection.cs)	(revision 3cf6af4f03c576c365448e0af315d58bf8217c7c)
+++ Riskeer/Piping/src/Riskeer.Piping.Data/PipingScenarioConfigurationPerFailureMechanismSection.cs	(.../PipingScenarioConfigurationPerFailureMechanismSection.cs)	(revision d9334d0a89e1271b4288b132c3148b539f3b0d22)
@@ -20,14 +20,15 @@
 // All rights reserved.
 
 using System;
+using Core.Common.Base;
 using Riskeer.Common.Data.FailureMechanism;
 
 namespace Riskeer.Piping.Data
 {
     /// <summary>
     /// This class holds the information of the scenario configuration of the <see cref="FailureMechanismSection"/>.
     /// </summary>
-    public class PipingScenarioConfigurationPerFailureMechanismSection
+    public class PipingScenarioConfigurationPerFailureMechanismSection : Observable
     {
         /// <summary>
         /// Creates a new instance of <see cref="PipingScenarioConfigurationPerFailureMechanismSection"/>.
Index: Riskeer/Piping/src/Riskeer.Piping.Forms/Views/PipingScenariosView.cs
===================================================================
diff -u -r0ebf41e1681ebb69d9092762c95d7c099c66267f -rd9334d0a89e1271b4288b132c3148b539f3b0d22
--- Riskeer/Piping/src/Riskeer.Piping.Forms/Views/PipingScenariosView.cs	(.../PipingScenariosView.cs)	(revision 0ebf41e1681ebb69d9092762c95d7c099c66267f)
+++ Riskeer/Piping/src/Riskeer.Piping.Forms/Views/PipingScenariosView.cs	(.../PipingScenariosView.cs)	(revision d9334d0a89e1271b4288b132c3148b539f3b0d22)
@@ -62,6 +62,8 @@
         private FailureMechanismSection selectedFailureMechanismSection;
         private PipingScenarioConfigurationPerFailureMechanismSection scenarioConfigurationTypeForSection;
 
+        private RadioButton checkedRadioButton;
+
         /// <summary>
         /// Creates a new instance of <see cref="PipingScenariosView"/>.
         /// </summary>
@@ -99,6 +101,8 @@
 
             InitializeCombobox();
 
+            checkedRadioButton = radioButtonSemiProbabilistic;
+            
             InitializeListBox();
             InitializeDataGridView();
 
@@ -325,15 +329,23 @@
 
         private void RadioButton_OnCheckedChanged(object sender, EventArgs e)
         {
+            var newCheckedRadioButton = (RadioButton) sender;
+            if (checkedRadioButton == newCheckedRadioButton)
+            {
+                return;
+            }
+            
             if (scenarioConfigurationTypeForSection != null)
             {
-                scenarioConfigurationTypeForSection.ScenarioConfigurationType = radioButtonSemiProbabilistic.Checked
+                scenarioConfigurationTypeForSection.ScenarioConfigurationType = newCheckedRadioButton == radioButtonSemiProbabilistic
                                                                                     ? PipingScenarioConfigurationPerFailureMechanismSectionType.SemiProbabilistic
                                                                                     : PipingScenarioConfigurationPerFailureMechanismSectionType.Probabilistic;
+                scenarioConfigurationTypeForSection.NotifyObservers();
             }
             
             UpdateVisibility();
             UpdateDataGridViewDataSource();
+            checkedRadioButton = newCheckedRadioButton;
         }
     }
 }
\ No newline at end of file
Index: Riskeer/Piping/test/Riskeer.Piping.Data.Test/PipingScenarioConfigurationPerFailureMechanismSectionTest.cs
===================================================================
diff -u -r3cf6af4f03c576c365448e0af315d58bf8217c7c -rd9334d0a89e1271b4288b132c3148b539f3b0d22
--- Riskeer/Piping/test/Riskeer.Piping.Data.Test/PipingScenarioConfigurationPerFailureMechanismSectionTest.cs	(.../PipingScenarioConfigurationPerFailureMechanismSectionTest.cs)	(revision 3cf6af4f03c576c365448e0af315d58bf8217c7c)
+++ Riskeer/Piping/test/Riskeer.Piping.Data.Test/PipingScenarioConfigurationPerFailureMechanismSectionTest.cs	(.../PipingScenarioConfigurationPerFailureMechanismSectionTest.cs)	(revision d9334d0a89e1271b4288b132c3148b539f3b0d22)
@@ -20,6 +20,7 @@
 // All rights reserved.
 
 using System;
+using Core.Common.Base;
 using NUnit.Framework;
 using Riskeer.Common.Data.FailureMechanism;
 using Riskeer.Common.Data.TestUtil;
@@ -50,6 +51,7 @@
             var scenarioConfigurationPerFailureMechanismSection = new PipingScenarioConfigurationPerFailureMechanismSection(section);
 
             // Assert
+            Assert.IsInstanceOf<Observable>(scenarioConfigurationPerFailureMechanismSection);
             Assert.AreSame(section, scenarioConfigurationPerFailureMechanismSection.Section);
             Assert.AreEqual(PipingScenarioConfigurationPerFailureMechanismSectionType.SemiProbabilistic,
                             scenarioConfigurationPerFailureMechanismSection.ScenarioConfigurationType);
Index: Riskeer/Piping/test/Riskeer.Piping.Forms.Test/Views/PipingScenariosViewTest.cs
===================================================================
diff -u -r68546c14ce0732fa3b17b6732fa3b72f15b07b04 -rd9334d0a89e1271b4288b132c3148b539f3b0d22
--- Riskeer/Piping/test/Riskeer.Piping.Forms.Test/Views/PipingScenariosViewTest.cs	(.../PipingScenariosViewTest.cs)	(revision 68546c14ce0732fa3b17b6732fa3b72f15b07b04)
+++ Riskeer/Piping/test/Riskeer.Piping.Forms.Test/Views/PipingScenariosViewTest.cs	(.../PipingScenariosViewTest.cs)	(revision d9334d0a89e1271b4288b132c3148b539f3b0d22)
@@ -405,26 +405,35 @@
         }
 
         [Test]
-        public void GivenPipingScenarioViewWithSections_WhenSelectingRadioButton_ThenDataGridViewUpdated()
+        public void GivenPipingScenarioViewWithSections_WhenSelectingRadioButton_ThenDataSetAndNotified()
         {
             // Given
+            var mocks = new MockRepository();
+            var observer = mocks.StrictMock<IObserver>();
+            observer.Expect(o => o.UpdateObserver());
+            mocks.ReplayAll();
+            
             var failureMechanism = new PipingFailureMechanism
             {
                 ScenarioConfigurationType = PipingScenarioConfigurationType.PerFailureMechanismSection
             };
             ShowFullyConfiguredPipingScenariosView(failureMechanism);
 
+            PipingScenarioConfigurationPerFailureMechanismSection scenarioConfigurationPerFailureMechanismSection = failureMechanism.ScenarioConfigurationsPerFailureMechanismSection.First();
+            scenarioConfigurationPerFailureMechanismSection.Attach(observer);
+            
             // Precondition
             Assert.AreEqual(PipingScenarioConfigurationPerFailureMechanismSectionType.SemiProbabilistic,
-                            failureMechanism.ScenarioConfigurationsPerFailureMechanismSection.First().ScenarioConfigurationType);
+                            scenarioConfigurationPerFailureMechanismSection.ScenarioConfigurationType);
 
             // When
             var radioButtonProbabilistic = (RadioButton) new RadioButtonTester("radioButtonProbabilistic").TheObject;
             radioButtonProbabilistic.Checked = true;
 
             // Then
             Assert.AreEqual(PipingScenarioConfigurationPerFailureMechanismSectionType.Probabilistic,
-                            failureMechanism.ScenarioConfigurationsPerFailureMechanismSection.First().ScenarioConfigurationType);
+                            scenarioConfigurationPerFailureMechanismSection.ScenarioConfigurationType);
+            mocks.VerifyAll();
         }
 
         [Test]