Index: Riskeer/DuneErosion/src/Riskeer.DuneErosion.Forms/PresentationObjects/DuneLocationCalculationsForUserDefinedTargetProbabilityContext.cs
===================================================================
diff -u -rc07341d07d9f9d32e1b5ac99d727396716e998a3 -r8ca6f19c77af27dd6e93556ae260f80bdff2b86a
--- Riskeer/DuneErosion/src/Riskeer.DuneErosion.Forms/PresentationObjects/DuneLocationCalculationsForUserDefinedTargetProbabilityContext.cs	(.../DuneLocationCalculationsForUserDefinedTargetProbabilityContext.cs)	(revision c07341d07d9f9d32e1b5ac99d727396716e998a3)
+++ Riskeer/DuneErosion/src/Riskeer.DuneErosion.Forms/PresentationObjects/DuneLocationCalculationsForUserDefinedTargetProbabilityContext.cs	(.../DuneLocationCalculationsForUserDefinedTargetProbabilityContext.cs)	(revision 8ca6f19c77af27dd6e93556ae260f80bdff2b86a)
@@ -20,16 +20,18 @@
 // All rights reserved.
 
 using System;
-using Core.Common.Controls.PresentationObjects;
+using Core.Common.Base;
 using Riskeer.Common.Data.AssessmentSection;
+using Riskeer.Common.Forms.PresentationObjects;
 using Riskeer.DuneErosion.Data;
 
 namespace Riskeer.DuneErosion.Forms.PresentationObjects
 {
     /// <summary>
     /// Presentation object for all dune location calculations based on a user defined target probability.
     /// </summary>
-    public class DuneLocationCalculationsForUserDefinedTargetProbabilityContext : ObservableWrappedObjectContextBase<DuneLocationCalculationsForTargetProbability>
+    public class DuneLocationCalculationsForUserDefinedTargetProbabilityContext
+        : LocationCalculationsContext<DuneLocationCalculationsForTargetProbability, DuneLocationCalculationsForTargetProbability>
     {
         /// <summary>
         /// Creates a new instance of <see cref="DuneLocationCalculationsForUserDefinedTargetProbabilityContext"/>.
@@ -66,5 +68,7 @@
         /// Gets the assessment section that the context belongs to.
         /// </summary>
         public IAssessmentSection AssessmentSection { get; }
+
+        protected override IObservableEnumerable<DuneLocationCalculationsForTargetProbability> LocationCalculationsEnumerationToObserve => FailureMechanism.DuneLocationCalculationsForUserDefinedTargetProbabilities;
     }
 }
\ No newline at end of file
Index: Riskeer/DuneErosion/src/Riskeer.DuneErosion.Plugin/DuneErosionPlugin.cs
===================================================================
diff -u -r16ba3eb172ac01be401442389ba665fe86ce7970 -r8ca6f19c77af27dd6e93556ae260f80bdff2b86a
--- Riskeer/DuneErosion/src/Riskeer.DuneErosion.Plugin/DuneErosionPlugin.cs	(.../DuneErosionPlugin.cs)	(revision 16ba3eb172ac01be401442389ba665fe86ce7970)
+++ Riskeer/DuneErosion/src/Riskeer.DuneErosion.Plugin/DuneErosionPlugin.cs	(.../DuneErosionPlugin.cs)	(revision 8ca6f19c77af27dd6e93556ae260f80bdff2b86a)
@@ -36,6 +36,7 @@
 using Core.Gui.Helpers;
 using Core.Gui.Plugin;
 using Riskeer.Common.Data.AssessmentSection;
+using Riskeer.Common.Forms.Helpers;
 using Riskeer.Common.Forms.PresentationObjects;
 using Riskeer.Common.Forms.TreeNodeInfos;
 using Riskeer.Common.Forms.TypeConverters;
@@ -149,7 +150,9 @@
 
             yield return new TreeNodeInfo<DuneLocationCalculationsForUserDefinedTargetProbabilityContext>
             {
-                Text = context => noProbabilityValueDoubleConverter.ConvertToString(context.WrappedData.TargetProbability),
+                Text = context => TargetProbabilityCalculationsDisplayNameHelper.GetUniqueDisplayNameForCalculations(context.WrappedData,
+                                                                                                                     context.FailureMechanism.DuneLocationCalculationsForUserDefinedTargetProbabilities,
+                                                                                                                     probability => probability.TargetProbability),
                 Image = context => RiskeerCommonFormsResources.GenericInputOutputIcon,
                 EnsureVisibleOnCreate = (context, o) => true,
                 CanRemove = (context, o) => true,
@@ -200,7 +203,10 @@
                                                                              context.AssessmentSection,
                                                                              () => context.WrappedData.TargetProbability,
                                                                              () => noProbabilityValueDoubleConverter.ConvertToString(context.WrappedData.TargetProbability)),
-                AfterCreate = (view, context) => { view.CalculationGuiService = duneLocationCalculationGuiService; }
+                AfterCreate = (view, context) =>
+                {
+                    view.CalculationGuiService = duneLocationCalculationGuiService;
+                }
             };
         }
 
@@ -499,6 +505,8 @@
                 duneLocationCalculationsForUserDefinedTargetProbabilityContext.WrappedData);
             duneLocationCalculationsForUserDefinedTargetProbabilitiesGroupContext.WrappedData.Insert(
                 position, duneLocationCalculationsForUserDefinedTargetProbabilityContext.WrappedData);
+
+            duneLocationCalculationsForUserDefinedTargetProbabilitiesGroupContext.WrappedData.NotifyObservers();
         }
 
         #endregion
Index: Riskeer/DuneErosion/test/Riskeer.DuneErosion.Forms.Test/PresentationObjects/DuneLocationCalculationsForUserDefinedTargetProbabilityContextTest.cs
===================================================================
diff -u -r9453b0efd19b36bd38b1bc4e79e4c29923965fce -r8ca6f19c77af27dd6e93556ae260f80bdff2b86a
--- Riskeer/DuneErosion/test/Riskeer.DuneErosion.Forms.Test/PresentationObjects/DuneLocationCalculationsForUserDefinedTargetProbabilityContextTest.cs	(.../DuneLocationCalculationsForUserDefinedTargetProbabilityContextTest.cs)	(revision 9453b0efd19b36bd38b1bc4e79e4c29923965fce)
+++ Riskeer/DuneErosion/test/Riskeer.DuneErosion.Forms.Test/PresentationObjects/DuneLocationCalculationsForUserDefinedTargetProbabilityContextTest.cs	(.../DuneLocationCalculationsForUserDefinedTargetProbabilityContextTest.cs)	(revision 8ca6f19c77af27dd6e93556ae260f80bdff2b86a)
@@ -20,9 +20,12 @@
 // All rights reserved.
 
 using System;
-using Core.Common.Controls.PresentationObjects;
+using System.Linq;
+using Core.Common.Base;
 using NUnit.Framework;
+using Rhino.Mocks;
 using Riskeer.Common.Data.TestUtil;
+using Riskeer.Common.Forms.PresentationObjects;
 using Riskeer.DuneErosion.Data;
 using Riskeer.DuneErosion.Forms.PresentationObjects;
 
@@ -71,9 +74,60 @@
                                                                                              assessmentSection);
 
             // Assert
-            Assert.IsInstanceOf<ObservableWrappedObjectContextBase<DuneLocationCalculationsForTargetProbability>>(context);
+            Assert.IsInstanceOf<LocationCalculationsContext<DuneLocationCalculationsForTargetProbability, DuneLocationCalculationsForTargetProbability>>(context);
             Assert.AreSame(duneLocationCalculationsForTargetProbability, context.WrappedData);
             Assert.AreSame(assessmentSection, context.AssessmentSection);
         }
+
+        [Test]
+        public void GivenContextWithObserverAttached_WhenNotifyingObserversOfDuneLocationCalculationsForUserDefinedTargetProbabilities_ThenObserverCorrectlyNotified()
+        {
+            // Given
+            var mockRepository = new MockRepository();
+            var observer = mockRepository.StrictMock<IObserver>();
+            observer.Expect(o => o.UpdateObserver());
+            mockRepository.ReplayAll();
+
+            var assessmentSection = new AssessmentSectionStub();
+            var failureMechanism = new DuneErosionFailureMechanism();
+            var calculationsForTargetProbability = new DuneLocationCalculationsForTargetProbability(0.1);
+            var context = new DuneLocationCalculationsForUserDefinedTargetProbabilityContext(calculationsForTargetProbability,
+                                                                                             failureMechanism,
+                                                                                             assessmentSection);
+
+            context.Attach(observer);
+
+            // When
+            failureMechanism.DuneLocationCalculationsForUserDefinedTargetProbabilities.NotifyObservers();
+
+            // Then
+            mockRepository.VerifyAll();
+        }
+
+        [Test]
+        public void GivenContextWithObserverAttached_WhenNotifyingObserversOfDuneLocationCalculationsForUserDefinedTargetProbability_ThenObserverCorrectlyNotified()
+        {
+            // Given
+            var mockRepository = new MockRepository();
+            var observer = mockRepository.StrictMock<IObserver>();
+            observer.Expect(o => o.UpdateObserver());
+            mockRepository.ReplayAll();
+
+            var assessmentSection = new AssessmentSectionStub();
+            var failureMechanism = new DuneErosionFailureMechanism();
+            var calculationsForTargetProbability = new DuneLocationCalculationsForTargetProbability(0.1);
+            failureMechanism.DuneLocationCalculationsForUserDefinedTargetProbabilities.Add(calculationsForTargetProbability);
+            var context = new DuneLocationCalculationsForUserDefinedTargetProbabilityContext(calculationsForTargetProbability,
+                                                                                             failureMechanism,
+                                                                                             assessmentSection);
+
+            context.Attach(observer);
+
+            // When
+            failureMechanism.DuneLocationCalculationsForUserDefinedTargetProbabilities.First().NotifyObservers();
+
+            // Then
+            mockRepository.VerifyAll();
+        }
     }
 }
\ No newline at end of file
Index: Riskeer/DuneErosion/test/Riskeer.DuneErosion.Plugin.Test/TreeNodeInfos/DuneLocationCalculationsForUserDefinedTargetProbabilityContextTreeNodeInfoTest.cs
===================================================================
diff -u -r9453b0efd19b36bd38b1bc4e79e4c29923965fce -r8ca6f19c77af27dd6e93556ae260f80bdff2b86a
--- Riskeer/DuneErosion/test/Riskeer.DuneErosion.Plugin.Test/TreeNodeInfos/DuneLocationCalculationsForUserDefinedTargetProbabilityContextTreeNodeInfoTest.cs	(.../DuneLocationCalculationsForUserDefinedTargetProbabilityContextTreeNodeInfoTest.cs)	(revision 9453b0efd19b36bd38b1bc4e79e4c29923965fce)
+++ Riskeer/DuneErosion/test/Riskeer.DuneErosion.Plugin.Test/TreeNodeInfos/DuneLocationCalculationsForUserDefinedTargetProbabilityContextTreeNodeInfoTest.cs	(.../DuneLocationCalculationsForUserDefinedTargetProbabilityContextTreeNodeInfoTest.cs)	(revision 8ca6f19c77af27dd6e93556ae260f80bdff2b86a)
@@ -109,21 +109,37 @@
         }
 
         [Test]
-        public void Text_WithContext_ReturnsFormattedTargetProbability()
+        [TestCase(0.025, 0.0025, 0.00025, "1/400")]
+        [TestCase(0.0025, 0.0025, 0.025, "1/400 (1)")]
+        [TestCase(0.0025, 0.0025, 0.0025, "1/400 (2)")]
+        public void Text_WithContext_ReturnsUniquelyFormattedTargetProbability(double userDefinedTargetProbability1,
+                                                                               double userDefinedTargetProbability2,
+                                                                               double userDefinedTargetProbability3,
+                                                                               string expectedText)
         {
             // Setup
-            var assessmentSection = mocks.Stub<IAssessmentSection>();
-            mocks.ReplayAll();
+            var failureMechanism = new DuneErosionFailureMechanism();
+            var calculationsForTargetProbability = new DuneLocationCalculationsForTargetProbability(userDefinedTargetProbability2);
+            var calculationsForTargetProbability2 = new DuneLocationCalculationsForTargetProbability(userDefinedTargetProbability3);
+            failureMechanism.DuneLocationCalculationsForUserDefinedTargetProbabilities.AddRange(new[]
+            {
+                new DuneLocationCalculationsForTargetProbability(userDefinedTargetProbability1),
+                calculationsForTargetProbability2,
+                calculationsForTargetProbability
+            });
 
-            var context = new DuneLocationCalculationsForUserDefinedTargetProbabilityContext(new DuneLocationCalculationsForTargetProbability(0.01),
-                                                                                             new DuneErosionFailureMechanism(),
-                                                                                             assessmentSection);
+            var context = new DuneLocationCalculationsForUserDefinedTargetProbabilityContext(calculationsForTargetProbability,
+                                                                                             failureMechanism,
+                                                                                             new AssessmentSectionStub(new[]
+                                                                                             {
+                                                                                                 failureMechanism
+                                                                                             }));
 
             // Call
             string text = info.Text(context);
 
             // Assert
-            Assert.AreEqual("1/100", text);
+            Assert.AreEqual(expectedText, text);
         }
 
         [Test]