Index: Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Forms/Views/MacroStabilityInwardsFailureMechanismResultView.cs
===================================================================
diff -u -r2a81f01756e227d5ce93717b21b87e8a5cd5fcbb -r2f287dc9b6b3487a792aff9281a15aa064779330
--- Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Forms/Views/MacroStabilityInwardsFailureMechanismResultView.cs	(.../MacroStabilityInwardsFailureMechanismResultView.cs)	(revision 2a81f01756e227d5ce93717b21b87e8a5cd5fcbb)
+++ Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Forms/Views/MacroStabilityInwardsFailureMechanismResultView.cs	(.../MacroStabilityInwardsFailureMechanismResultView.cs)	(revision 2f287dc9b6b3487a792aff9281a15aa064779330)
@@ -177,6 +177,12 @@
                 nameof(MacroStabilityInwardsFailureMechanismSectionResultRow.ManualAssemblyProbability));
         }
 
+        protected override void RefreshDataGrid()
+        {
+            base.RefreshDataGrid();
+            DataGridViewControl.AutoResizeColumn(combinedAssemblyProbabilityIndex);
+        }
+
         protected override void UpdateAssemblyResultControl()
         {
             FailureMechanismAssemblyResultControl.SetAssemblyResult(MacroStabilityInwardsFailureMechanismAssemblyFactory.AssembleFailureMechanism(FailureMechanism, assessmentSection, true));
Index: Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Forms.Test/Views/MacroStabilityInwardsFailureMechanismResultViewTest.cs
===================================================================
diff -u -r2a81f01756e227d5ce93717b21b87e8a5cd5fcbb -r2f287dc9b6b3487a792aff9281a15aa064779330
--- Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Forms.Test/Views/MacroStabilityInwardsFailureMechanismResultViewTest.cs	(.../MacroStabilityInwardsFailureMechanismResultViewTest.cs)	(revision 2a81f01756e227d5ce93717b21b87e8a5cd5fcbb)
+++ Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Forms.Test/Views/MacroStabilityInwardsFailureMechanismResultViewTest.cs	(.../MacroStabilityInwardsFailureMechanismResultViewTest.cs)	(revision 2f287dc9b6b3487a792aff9281a15aa064779330)
@@ -22,9 +22,11 @@
 using System;
 using System.Linq;
 using System.Windows.Forms;
+using Core.Common.TestUtil;
 using NUnit.Extensions.Forms;
 using NUnit.Framework;
 using Rhino.Mocks;
+using Ringtoets.AssemblyTool.Data;
 using Ringtoets.AssemblyTool.KernelWrapper.Calculators;
 using Ringtoets.AssemblyTool.KernelWrapper.TestUtil.Calculators;
 using Ringtoets.AssemblyTool.KernelWrapper.TestUtil.Calculators.Assembly;
@@ -117,7 +119,7 @@
             using (ShowFailureMechanismResultsView(new MacroStabilityInwardsFailureMechanism()))
             {
                 // Then
-                var dataGridView = (DataGridView) new ControlTester("dataGridView").TheObject;
+                DataGridView dataGridView = GetDataGridView();
 
                 Assert.AreEqual(columnCount, dataGridView.ColumnCount);
                 Assert.IsTrue(dataGridView.Columns[detailedAssessmentProbabilityIndex].ReadOnly);
@@ -183,7 +185,7 @@
             using (new AssemblyToolCalculatorFactoryConfig())
             using (ShowFailureMechanismResultsView(failureMechanism))
             {
-                var dataGridView = (DataGridView) new ControlTester("dataGridView").TheObject;
+                DataGridView dataGridView = GetDataGridView();
 
                 // Assert
                 DataGridViewRowCollection rows = dataGridView.Rows;
@@ -233,6 +235,41 @@
             }
         }
 
+        [Test]
+        public void GivenFailureMechanismResultView_WhenRowUpdated_ThenCombinedAssemblyProbabilityColumnAutoResizes()
+        {
+            // Given
+            var random = new Random(39);
+            var failureMechanism = new MacroStabilityInwardsFailureMechanism();
+            FailureMechanismTestHelper.AddSections(failureMechanism, 1);
+
+            using (new AssemblyToolCalculatorFactoryConfig())
+            using (ShowFailureMechanismResultsView(failureMechanism))
+            {
+                DataGridView dataGridView = GetDataGridView();
+                var row = (MacroStabilityInwardsFailureMechanismSectionResultRow) dataGridView.Rows[0].DataBoundItem;
+
+                var calculatorFactory = (TestAssemblyToolCalculatorFactory) AssemblyToolCalculatorFactory.Instance;
+                FailureMechanismSectionAssemblyCalculatorStub calculator = calculatorFactory.LastCreatedFailureMechanismSectionAssemblyCalculator;
+                calculator.CombinedAssemblyOutput = new FailureMechanismSectionAssembly(0.1, random.NextEnumValue<FailureMechanismSectionAssemblyCategoryGroup>());
+                DataGridViewCell dataGridViewCell = dataGridView.Rows[0].Cells[combinedAssemblyProbabilityIndex];
+                int initialWidth = dataGridViewCell.OwningColumn.Width;
+
+                // When
+                calculator.CombinedAssemblyOutput = new FailureMechanismSectionAssembly(0.0000000000000000000000000001, random.NextEnumValue<FailureMechanismSectionAssemblyCategoryGroup>());
+                row.TailorMadeAssessmentProbability = random.NextDouble();
+
+                // Then
+                int newWidth = dataGridViewCell.OwningColumn.Width;
+                Assert.Less(initialWidth, newWidth);
+            }
+        }
+
+        private static DataGridView GetDataGridView()
+        {
+            return (DataGridView) new ControlTester("dataGridView").TheObject;
+        }
+
         [TestFixture]
         public class MacroStabilityInwardsFailureMechanismAssemblyControlTest : FailureMechanismAssemblyResultWithProbabilityControlTestFixture<
             MacroStabilityInwardsFailureMechanismResultView,