Index: Ringtoets/Common/src/Ringtoets.Common.Data/Hydraulics/HydraulicBoundaryLocationCalculation.cs
===================================================================
diff -u -rd2d2142de47452c1faa571a5de3157d6f3205812 -rcd48021e80f6584ce1e29c8ab85365fb055a3a1e
--- Ringtoets/Common/src/Ringtoets.Common.Data/Hydraulics/HydraulicBoundaryLocationCalculation.cs	(.../HydraulicBoundaryLocationCalculation.cs)	(revision d2d2142de47452c1faa571a5de3157d6f3205812)
+++ Ringtoets/Common/src/Ringtoets.Common.Data/Hydraulics/HydraulicBoundaryLocationCalculation.cs	(.../HydraulicBoundaryLocationCalculation.cs)	(revision cd48021e80f6584ce1e29c8ab85365fb055a3a1e)
@@ -59,11 +59,14 @@
         /// Gets a value indicating whether the calculation has already been calculated.
         /// </summary>
         /// <returns><c>true</c> if the calculation is fully calculated, <c>false</c> otherwise.</returns>
-        /// <remarks>A calculation is fully calculated, depending on if the illustration points 
+        /// <remarks>A calculation is fully calculated, depending on whether the illustration points 
         /// are set to be calculated.</remarks>
-        public bool IsCalculated()
+        public bool IsCalculated
         {
-            return HasOutput && InputParameters.ShouldIllustrationPointsBeCalculated == Output.HasGeneralResult;
+            get
+            {
+                return HasOutput && InputParameters.ShouldIllustrationPointsBeCalculated == Output.HasGeneralResult;
+            }
         }
     }
 }
\ No newline at end of file
Index: Ringtoets/Common/src/Ringtoets.Common.Service/DesignWaterLevelCalculationActivity.cs
===================================================================
diff -u -rd2d2142de47452c1faa571a5de3157d6f3205812 -rcd48021e80f6584ce1e29c8ab85365fb055a3a1e
--- Ringtoets/Common/src/Ringtoets.Common.Service/DesignWaterLevelCalculationActivity.cs	(.../DesignWaterLevelCalculationActivity.cs)	(revision d2d2142de47452c1faa571a5de3157d6f3205812)
+++ Ringtoets/Common/src/Ringtoets.Common.Service/DesignWaterLevelCalculationActivity.cs	(.../DesignWaterLevelCalculationActivity.cs)	(revision cd48021e80f6584ce1e29c8ab85365fb055a3a1e)
@@ -88,7 +88,7 @@
 
         protected override bool Validate()
         {
-            if (hydraulicBoundaryLocationCalculation.IsCalculated())
+            if (hydraulicBoundaryLocationCalculation.IsCalculated)
             {
                 State = ActivityState.Skipped;
                 return true;
Index: Ringtoets/Common/src/Ringtoets.Common.Service/WaveHeightCalculationActivity.cs
===================================================================
diff -u -r1d54902642a3e1bf3b173afa85cebfa52afb0c15 -rcd48021e80f6584ce1e29c8ab85365fb055a3a1e
--- Ringtoets/Common/src/Ringtoets.Common.Service/WaveHeightCalculationActivity.cs	(.../WaveHeightCalculationActivity.cs)	(revision 1d54902642a3e1bf3b173afa85cebfa52afb0c15)
+++ Ringtoets/Common/src/Ringtoets.Common.Service/WaveHeightCalculationActivity.cs	(.../WaveHeightCalculationActivity.cs)	(revision cd48021e80f6584ce1e29c8ab85365fb055a3a1e)
@@ -88,7 +88,7 @@
 
         protected override bool Validate()
         {
-            if (hydraulicBoundaryLocationCalculation.IsCalculated())
+            if (hydraulicBoundaryLocationCalculation.IsCalculated)
             {
                 State = ActivityState.Skipped;
                 return true;
Index: Ringtoets/Common/test/Ringtoets.Common.Data.Test/Hydraulics/HydraulicBoundaryLocationCalculationTest.cs
===================================================================
diff -u -rd2d2142de47452c1faa571a5de3157d6f3205812 -rcd48021e80f6584ce1e29c8ab85365fb055a3a1e
--- Ringtoets/Common/test/Ringtoets.Common.Data.Test/Hydraulics/HydraulicBoundaryLocationCalculationTest.cs	(.../HydraulicBoundaryLocationCalculationTest.cs)	(revision d2d2142de47452c1faa571a5de3157d6f3205812)
+++ Ringtoets/Common/test/Ringtoets.Common.Data.Test/Hydraulics/HydraulicBoundaryLocationCalculationTest.cs	(.../HydraulicBoundaryLocationCalculationTest.cs)	(revision cd48021e80f6584ce1e29c8ab85365fb055a3a1e)
@@ -23,6 +23,7 @@
 using NUnit.Framework;
 using Ringtoets.Common.Data.Hydraulics;
 using Ringtoets.Common.Data.TestUtil;
+using Ringtoets.Common.Data.TestUtil.IllustrationPoints;
 
 namespace Ringtoets.Common.Data.Test.Hydraulics
 {
@@ -61,11 +62,11 @@
 
         [Test]
         [TestCaseSource(nameof(GetHydraulicBoundaryLocationCalculations))]
-        public void IsCalculated_NotFullyCalculated_ReturnIsCalculated(HydraulicBoundaryLocationCalculation hydraulicBoundaryLocationCalculation,
-                                                                       bool expectedIsCalculated)
+        public void IsCalculated_Always_ReturnIsCalculated(HydraulicBoundaryLocationCalculation hydraulicBoundaryLocationCalculation,
+                                                           bool expectedIsCalculated)
         {
             // Call
-            bool isCalculated = hydraulicBoundaryLocationCalculation.IsCalculated();
+            bool isCalculated = hydraulicBoundaryLocationCalculation.IsCalculated;
 
             // Assert
             Assert.AreEqual(expectedIsCalculated, isCalculated);
@@ -88,6 +89,20 @@
             {
                 Output = new TestHydraulicBoundaryLocationOutput(1.0, CalculationConvergence.CalculatedConverged)
             }, true);
+
+            yield return new TestCaseData(new HydraulicBoundaryLocationCalculation
+            {
+                InputParameters =
+                {
+                    ShouldIllustrationPointsBeCalculated = true
+                },
+                Output = new TestHydraulicBoundaryLocationOutput(1.0, new TestGeneralResultSubMechanismIllustrationPoint())
+            }, true);
+
+            yield return new TestCaseData(new HydraulicBoundaryLocationCalculation
+            {
+                Output = new TestHydraulicBoundaryLocationOutput(1.0, new TestGeneralResultSubMechanismIllustrationPoint())
+            }, false);
         }
     }
 }
\ No newline at end of file