Index: Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Service/GrassCoverErosionOutwardsWaveConditionsCalculationActivity.cs
===================================================================
diff -u -r2b9f000bc1f88cdaf1c348b049d6e9a3a47d48f9 -r4098e7338585cd9047636c465ffcb213c12bf987
--- Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Service/GrassCoverErosionOutwardsWaveConditionsCalculationActivity.cs	(.../GrassCoverErosionOutwardsWaveConditionsCalculationActivity.cs)	(revision 2b9f000bc1f88cdaf1c348b049d6e9a3a47d48f9)
+++ Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Service/GrassCoverErosionOutwardsWaveConditionsCalculationActivity.cs	(.../GrassCoverErosionOutwardsWaveConditionsCalculationActivity.cs)	(revision 4098e7338585cd9047636c465ffcb213c12bf987)
@@ -81,7 +81,7 @@
 
         protected override void PerformCalculation()
         {
-            calculationService.OnProgress = UpdateProgressText;
+            calculationService.OnProgressChanged += UpdateProgressText;
 
             GrassCoverErosionOutwardsDataSynchronizationService.ClearWaveConditionsCalculationOutput(calculation);
             calculationService.Calculate(
Index: Ringtoets/Revetment/src/Ringtoets.Revetment.Service/WaveConditionsCalculationServiceBase.cs
===================================================================
diff -u -r9e877195a92839a9f121a3b4cac77712b63b589b -r4098e7338585cd9047636c465ffcb213c12bf987
--- Ringtoets/Revetment/src/Ringtoets.Revetment.Service/WaveConditionsCalculationServiceBase.cs	(.../WaveConditionsCalculationServiceBase.cs)	(revision 9e877195a92839a9f121a3b4cac77712b63b589b)
+++ Ringtoets/Revetment/src/Ringtoets.Revetment.Service/WaveConditionsCalculationServiceBase.cs	(.../WaveConditionsCalculationServiceBase.cs)	(revision 4098e7338585cd9047636c465ffcb213c12bf987)
@@ -48,13 +48,16 @@
     public abstract class WaveConditionsCalculationServiceBase
     {
         private static readonly ILog log = LogManager.GetLogger(typeof(WaveConditionsCalculationServiceBase));
-
-        public OnProgressChanged OnProgress;
         protected int TotalWaterLevelCalculations;
         private int currentStep = 1;
         private IWaveConditionsCosineCalculator calculator;
 
         /// <summary>
+        /// Fired when the calculation progress changed.
+        /// </summary>
+        public event OnProgressChanged OnProgressChanged;
+
+        /// <summary>
         /// Cancels any currently running wave conditions calculation.
         /// </summary>
         public void Cancel()
@@ -239,7 +242,7 @@
         private void NotifyProgress(RoundedDouble waterLevel, int currentStepNumber, int totalStepsNumber)
         {
             string message = string.Format(Resources.WaveConditionsCalculationService_OnRun_Calculate_for_waterlevel_0_, waterLevel);
-            OnProgress?.Invoke(message, currentStepNumber, totalStepsNumber);
+            OnProgressChanged?.Invoke(message, currentStepNumber, totalStepsNumber);
         }
 
         /// <summary>
Index: Ringtoets/StabilityStoneCover/src/Ringtoets.StabilityStoneCover.Service/StabilityStoneCoverWaveConditionsCalculationActivity.cs
===================================================================
diff -u -r2b9f000bc1f88cdaf1c348b049d6e9a3a47d48f9 -r4098e7338585cd9047636c465ffcb213c12bf987
--- Ringtoets/StabilityStoneCover/src/Ringtoets.StabilityStoneCover.Service/StabilityStoneCoverWaveConditionsCalculationActivity.cs	(.../StabilityStoneCoverWaveConditionsCalculationActivity.cs)	(revision 2b9f000bc1f88cdaf1c348b049d6e9a3a47d48f9)
+++ Ringtoets/StabilityStoneCover/src/Ringtoets.StabilityStoneCover.Service/StabilityStoneCoverWaveConditionsCalculationActivity.cs	(.../StabilityStoneCoverWaveConditionsCalculationActivity.cs)	(revision 4098e7338585cd9047636c465ffcb213c12bf987)
@@ -80,7 +80,7 @@
 
         protected override void PerformCalculation()
         {
-            calculationService.OnProgress = UpdateProgressText;
+            calculationService.OnProgressChanged += UpdateProgressText;
 
             StabilityStoneCoverDataSynchronizationService.ClearWaveConditionsCalculationOutput(calculation);
             calculationService.Calculate(
Index: Ringtoets/StabilityStoneCover/test/Ringtoets.StabilityStoneCover.Service.Test/StabilityStoneCoverWaveConditionsCalculationServiceTest.cs
===================================================================
diff -u -r9e877195a92839a9f121a3b4cac77712b63b589b -r4098e7338585cd9047636c465ffcb213c12bf987
--- Ringtoets/StabilityStoneCover/test/Ringtoets.StabilityStoneCover.Service.Test/StabilityStoneCoverWaveConditionsCalculationServiceTest.cs	(.../StabilityStoneCoverWaveConditionsCalculationServiceTest.cs)	(revision 9e877195a92839a9f121a3b4cac77712b63b589b)
+++ Ringtoets/StabilityStoneCover/test/Ringtoets.StabilityStoneCover.Service.Test/StabilityStoneCoverWaveConditionsCalculationServiceTest.cs	(.../StabilityStoneCoverWaveConditionsCalculationServiceTest.cs)	(revision 4098e7338585cd9047636c465ffcb213c12bf987)
@@ -290,7 +290,7 @@
             {
                 var currentStep = 1;
                 var stabilityStoneCoverWaveConditionsCalculationService = new StabilityStoneCoverWaveConditionsCalculationService();
-                stabilityStoneCoverWaveConditionsCalculationService.OnProgress += (description, step, steps) =>
+                stabilityStoneCoverWaveConditionsCalculationService.OnProgressChanged += (description, step, steps) =>
                 {
                     // Assert
                     string text = $"Berekenen voor een waterstand van '{waterLevels[(step - 1) % waterLevels.Length]}' [m+NAP].";
Index: Ringtoets/WaveImpactAsphaltCover/src/Ringtoets.WaveImpactAsphaltCover.Service/WaveImpactAsphaltCoverWaveConditionsCalculationActivity.cs
===================================================================
diff -u -r2b9f000bc1f88cdaf1c348b049d6e9a3a47d48f9 -r4098e7338585cd9047636c465ffcb213c12bf987
--- Ringtoets/WaveImpactAsphaltCover/src/Ringtoets.WaveImpactAsphaltCover.Service/WaveImpactAsphaltCoverWaveConditionsCalculationActivity.cs	(.../WaveImpactAsphaltCoverWaveConditionsCalculationActivity.cs)	(revision 2b9f000bc1f88cdaf1c348b049d6e9a3a47d48f9)
+++ Ringtoets/WaveImpactAsphaltCover/src/Ringtoets.WaveImpactAsphaltCover.Service/WaveImpactAsphaltCoverWaveConditionsCalculationActivity.cs	(.../WaveImpactAsphaltCoverWaveConditionsCalculationActivity.cs)	(revision 4098e7338585cd9047636c465ffcb213c12bf987)
@@ -80,7 +80,7 @@
 
         protected override void PerformCalculation()
         {
-            calculationService.OnProgress = UpdateProgressText;
+            calculationService.OnProgressChanged += UpdateProgressText;
 
             WaveImpactAsphaltCoverDataSynchronizationService.ClearWaveConditionsCalculationOutput(calculation);
             calculationService.Calculate(