Index: Riskeer/Piping/src/Riskeer.Piping.Forms/Views/PipingFailureMechanismResultView.cs
===================================================================
diff -u -r5412b4f96ab3b27e5f8d053773d88859f165890e -rb24a89c790d199d7f70133aed2f47784baa201ca
--- Riskeer/Piping/src/Riskeer.Piping.Forms/Views/PipingFailureMechanismResultView.cs	(.../PipingFailureMechanismResultView.cs)	(revision 5412b4f96ab3b27e5f8d053773d88859f165890e)
+++ Riskeer/Piping/src/Riskeer.Piping.Forms/Views/PipingFailureMechanismResultView.cs	(.../PipingFailureMechanismResultView.cs)	(revision b24a89c790d199d7f70133aed2f47784baa201ca)
@@ -65,15 +65,17 @@
             calculationInputObserver = new RecursiveObserver<CalculationGroup, ICalculationInput>(
                 UpdateView,
                 cg => cg.Children.Concat<object>(cg.Children
-                                                   .OfType<SemiProbabilisticPipingCalculationScenario>()
-                                                   .Select(c => c.InputParameters)));
+                                                   .OfType<IPipingCalculationScenario<PipingInput>>()
+                                                   .Select(c => c.InputParameters)))
+            {
+                Observable = failureMechanism.CalculationsGroup
+            };
             calculationGroupObserver = new RecursiveObserver<CalculationGroup, ICalculationBase>(
                 UpdateView,
-                c => c.Children);
-
-            CalculationGroup observableGroup = failureMechanism.CalculationsGroup;
-            calculationInputObserver.Observable = observableGroup;
-            calculationGroupObserver.Observable = observableGroup;
+                c => c.Children)
+            {
+                Observable = failureMechanism.CalculationsGroup
+            };
         }
 
         protected override void Dispose(bool disposing)
Index: Riskeer/Piping/test/Riskeer.Piping.Forms.Test/Views/PipingFailureMechanismResultViewTest.cs
===================================================================
diff -u -rcec2e1c9d537ddf703b6de52fcbfc8982ef6cea6 -rb24a89c790d199d7f70133aed2f47784baa201ca
--- Riskeer/Piping/test/Riskeer.Piping.Forms.Test/Views/PipingFailureMechanismResultViewTest.cs	(.../PipingFailureMechanismResultViewTest.cs)	(revision cec2e1c9d537ddf703b6de52fcbfc8982ef6cea6)
+++ Riskeer/Piping/test/Riskeer.Piping.Forms.Test/Views/PipingFailureMechanismResultViewTest.cs	(.../PipingFailureMechanismResultViewTest.cs)	(revision b24a89c790d199d7f70133aed2f47784baa201ca)
@@ -29,6 +29,7 @@
 using Riskeer.Common.Data.TestUtil;
 using Riskeer.Common.Forms.Views;
 using Riskeer.Piping.Data;
+using Riskeer.Piping.Data.TestUtil;
 using Riskeer.Piping.Forms.Views;
 
 namespace Riskeer.Piping.Forms.Test.Views
@@ -177,6 +178,60 @@
             }
         }
 
+        [Test]
+        public void GivenPipingFailureMechanismResultView_WhenCalculationUpdatedAndNotifiesObservers_ThenDataGridViewUpdated()
+        {
+            // Given
+            var failureMechanism = new PipingFailureMechanism();
+            FailureMechanismTestHelper.SetSections(failureMechanism, new[]
+            {
+                FailureMechanismSectionTestFactory.CreateFailureMechanismSection("Section 1")
+            });
+
+            var calculationScenario = new TestPipingCalculationScenario();
+            failureMechanism.CalculationsGroup.Children.Add(calculationScenario);
+
+            using (ShowFailureMechanismResultsView(failureMechanism))
+            {
+                var rowsChanged = false;
+                DataGridView dataGridView = GetDataGridView();
+                dataGridView.Rows.CollectionChanged += (sender, args) => rowsChanged = true;
+
+                // When
+                calculationScenario.NotifyObservers();
+
+                // Then
+                Assert.IsTrue(rowsChanged);
+            }
+        }
+
+        [Test]
+        public void GivenPipingFailureMechanismResultView_WhenCalculationInputUpdatedAndNotifiesObservers_ThenDataGridViewUpdated()
+        {
+            // Given
+            var failureMechanism = new PipingFailureMechanism();
+            FailureMechanismTestHelper.SetSections(failureMechanism, new[]
+            {
+                FailureMechanismSectionTestFactory.CreateFailureMechanismSection("Section 1")
+            });
+
+            var calculationScenario = new TestPipingCalculationScenario();
+            failureMechanism.CalculationsGroup.Children.Add(calculationScenario);
+
+            using (ShowFailureMechanismResultsView(failureMechanism))
+            {
+                var rowsChanged = false;
+                DataGridView dataGridView = GetDataGridView();
+                dataGridView.Rows.CollectionChanged += (sender, args) => rowsChanged = true;
+
+                // When
+                calculationScenario.InputParameters.NotifyObservers();
+
+                // Then
+                Assert.IsTrue(rowsChanged);
+            }
+        }
+
         private static DataGridView GetDataGridView()
         {
             return (DataGridView) new ControlTester("dataGridView").TheObject;