Index: Ringtoets/HydraRing/src/Ringtoets.HydraRing.Calculation/Service/TargetProbabilityCalculationActivity.cs
===================================================================
diff -u -rf0b17fbeaae5235e062c016de9adf3c0c209720f -r45b46673706b2fa064e6078dd9a1bdb64109bb29
--- Ringtoets/HydraRing/src/Ringtoets.HydraRing.Calculation/Service/TargetProbabilityCalculationActivity.cs	(.../TargetProbabilityCalculationActivity.cs)	(revision f0b17fbeaae5235e062c016de9adf3c0c209720f)
+++ Ringtoets/HydraRing/src/Ringtoets.HydraRing.Calculation/Service/TargetProbabilityCalculationActivity.cs	(.../TargetProbabilityCalculationActivity.cs)	(revision 45b46673706b2fa064e6078dd9a1bdb64109bb29)
@@ -19,6 +19,7 @@
 // Stichting Deltares and remain full property of Stichting Deltares at all times.
 // All rights reserved.
 
+using System;
 using Core.Common.Base.Service;
 using Ringtoets.HydraRing.Calculation.Data;
 using Ringtoets.HydraRing.Calculation.Data.Input;
@@ -37,6 +38,7 @@
         private readonly HydraRingTimeIntegrationSchemeType timeIntegrationSchemeType;
         private readonly HydraRingUncertaintiesType uncertaintiesType;
         private readonly TargetProbabilityCalculationInput targetProbabilityCalculationInput;
+        private readonly Action<TargetProbabilityCalculationOutput> handleCalculationOutputAction;
         private TargetProbabilityCalculationOutput targetProbabilityCalculationOutput;
 
         /// <summary>
@@ -48,20 +50,23 @@
         /// <param name="timeIntegrationSchemeType">The <see cref="HydraRingTimeIntegrationSchemeType"/> to use while executing the calculation.</param>
         /// <param name="uncertaintiesType">The <see cref="HydraRingUncertaintiesType"/> to use while executing the calculation.</param>
         /// <param name="targetProbabilityCalculationInput">The input of the calculation to perform.</param>
+        /// <param name="handleCalculationOutputAction">The action to perform after the calculation is performed.</param>
         public TargetProbabilityCalculationActivity(
             string name,
             string hlcdDirectory,
             string ringId,
             HydraRingTimeIntegrationSchemeType timeIntegrationSchemeType,
             HydraRingUncertaintiesType uncertaintiesType,
-            TargetProbabilityCalculationInput targetProbabilityCalculationInput)
+            TargetProbabilityCalculationInput targetProbabilityCalculationInput,
+            Action<TargetProbabilityCalculationOutput> handleCalculationOutputAction)
         {
             this.name = name;
             this.hlcdDirectory = hlcdDirectory;
             this.ringId = ringId;
             this.timeIntegrationSchemeType = timeIntegrationSchemeType;
             this.uncertaintiesType = uncertaintiesType;
             this.targetProbabilityCalculationInput = targetProbabilityCalculationInput;
+            this.handleCalculationOutputAction = handleCalculationOutputAction;
         }
 
         public override string Name
@@ -84,7 +89,10 @@
 
         protected override void OnFinish()
         {
-            // TODO: Implement logic for correctly handling the targetProbabilityCalculationOutput
+            if (targetProbabilityCalculationOutput != null)
+            {
+                handleCalculationOutputAction(targetProbabilityCalculationOutput);
+            }
         }
     }
 }
Index: Ringtoets/Integration/src/Ringtoets.Integration.Plugin/RingtoetsGuiPlugin.cs
===================================================================
diff -u -r3a78d46ff29f71c0de1e46381ea3aed557903eec -r45b46673706b2fa064e6078dd9a1bdb64109bb29
--- Ringtoets/Integration/src/Ringtoets.Integration.Plugin/RingtoetsGuiPlugin.cs	(.../RingtoetsGuiPlugin.cs)	(revision 3a78d46ff29f71c0de1e46381ea3aed557903eec)
+++ Ringtoets/Integration/src/Ringtoets.Integration.Plugin/RingtoetsGuiPlugin.cs	(.../RingtoetsGuiPlugin.cs)	(revision 45b46673706b2fa064e6078dd9a1bdb64109bb29)
@@ -447,12 +447,14 @@
                 (sender, args) =>
                 {
                     var hlcdDirectory = Path.GetDirectoryName(nodeData.Parent.HydraulicBoundaryDatabase.FilePath);
-                    var activities = nodeData.Parent.HydraulicBoundaryDatabase.Locations.Select(hbl => new TargetProbabilityCalculationActivity(string.Format(Resources.RingtoetsGuiPlugin_Calculate_assessment_level_for_location_0_, hbl.Id),
-                        hlcdDirectory,
-                        "",
-                        HydraRingTimeIntegrationSchemeType.FBC,
-                        HydraRingUncertaintiesType.All,
-                        new AssessmentLevelCalculationInput((int) hbl.Id, nodeData.Parent.FailureMechanismContribution.Norm)));
+                    var activities = nodeData.Parent.HydraulicBoundaryDatabase.Locations.Select(hbl => new TargetProbabilityCalculationActivity(
+                                                                                                           string.Format(Resources.RingtoetsGuiPlugin_Calculate_assessment_level_for_location_0_, hbl.Id),
+                                                                                                           hlcdDirectory,
+                                                                                                           "",
+                                                                                                           HydraRingTimeIntegrationSchemeType.FBC,
+                                                                                                           HydraRingUncertaintiesType.All,
+                                                                                                           new AssessmentLevelCalculationInput((int) hbl.Id, nodeData.Parent.FailureMechanismContribution.Norm),
+                                                                                                           output => hbl.DesignWaterLevel = output.Result)).ToList();
 
                     ActivityProgressDialogRunner.Run(Gui.MainWindow, activities);
                 }