Index: Ringtoets/Common/src/Ringtoets.Common.Forms/ChangeHandlers/CalculationChangeHandler.cs
===================================================================
diff -u
--- Ringtoets/Common/src/Ringtoets.Common.Forms/ChangeHandlers/CalculationChangeHandler.cs	(revision 0)
+++ Ringtoets/Common/src/Ringtoets.Common.Forms/ChangeHandlers/CalculationChangeHandler.cs	(revision 2702ecf9aaf678cf869dc330f8ff560b3de4672a)
@@ -0,0 +1,79 @@
+// Copyright (C) Stichting Deltares 2017. All rights reserved.
+//
+// This file is part of Ringtoets.
+//
+// Ringtoets is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+//
+// All names, logos, and references to "Deltares" are registered trademarks of
+// Stichting Deltares and remain full property of Stichting Deltares at all times.
+// All rights reserved.
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Core.Common.Gui;
+using Ringtoets.Common.Data.Calculation;
+using Ringtoets.Common.IO;
+
+namespace Ringtoets.Common.Forms.ChangeHandlers
+{
+    /// <summary>
+    /// Class which can, if required, inquire the user for a confirmation when a change to the
+    /// calculations requires calculation results to be altered.
+    /// </summary>
+    public class CalculationChangeHandler : IConfirmDataChangeHandler
+    {
+        private readonly string query;
+        private readonly IEnumerable<ICalculation> calculations;
+        private readonly IInquiryHelper inquiryHandler;
+
+        /// <summary>
+        /// Creates a new instance of <see cref="CalculationChangeHandler"/>.
+        /// </summary>
+        /// <param name="calculations">The calculations for which to handle changes.</param>
+        /// <param name="query">The query which should be displayed when inquiring for a confirmation.</param>
+        /// <param name="inquiryHandler">Object responsible for inquiring the required data.</param>
+        /// <exception cref="ArgumentNullException">Thrown when any parameter is <c>null</c>.</exception>
+        public CalculationChangeHandler(IEnumerable<ICalculation> calculations,
+                                        string query,
+                                        IInquiryHelper inquiryHandler)
+        {
+            if (calculations == null)
+            {
+                throw new ArgumentNullException(nameof(calculations));
+            }
+            if (query == null)
+            {
+                throw new ArgumentNullException(nameof(query));
+            }
+            if (inquiryHandler == null)
+            {
+                throw new ArgumentNullException(nameof(inquiryHandler));
+            }
+            this.calculations = calculations;
+            this.query = query;
+            this.inquiryHandler = inquiryHandler;
+        }
+
+        public bool RequireConfirmation()
+        {
+            return calculations.Any(calc => calc.HasOutput);
+        }
+
+        public bool InquireConfirmation()
+        {
+            return inquiryHandler.InquireContinuation(query);
+        }
+    }
+}
\ No newline at end of file
Index: Ringtoets/Common/src/Ringtoets.Common.Forms/ChangeHandlers/FailureMechanismCalculationChangeHandler.cs
===================================================================
diff -u -rb3b6c13cf736c134476b3db34281332d01ca86b1 -r2702ecf9aaf678cf869dc330f8ff560b3de4672a
--- Ringtoets/Common/src/Ringtoets.Common.Forms/ChangeHandlers/FailureMechanismCalculationChangeHandler.cs	(.../FailureMechanismCalculationChangeHandler.cs)	(revision b3b6c13cf736c134476b3db34281332d01ca86b1)
+++ Ringtoets/Common/src/Ringtoets.Common.Forms/ChangeHandlers/FailureMechanismCalculationChangeHandler.cs	(.../FailureMechanismCalculationChangeHandler.cs)	(revision 2702ecf9aaf678cf869dc330f8ff560b3de4672a)
@@ -40,7 +40,7 @@
         /// <summary>
         /// Creates a new instance of <see cref="FailureMechanismCalculationChangeHandler"/>.
         /// </summary>
-        /// <param name="failureMechanism">Failure mechanism for which to handle changes of the failure mechanism.</param>
+        /// <param name="failureMechanism">Failure mechanism for which to handle changes.</param>
         /// <param name="query">The query which should be displayed when inquiring for a confirmation.</param>
         /// <param name="inquiryHandler">Object responsible for inquiring required data.</param>
         /// <exception cref="ArgumentNullException">Thrown when any input parameter is <c>null</c>.</exception>
Index: Ringtoets/Common/src/Ringtoets.Common.Forms/Ringtoets.Common.Forms.csproj
===================================================================
diff -u -ra7f920661887773056c051edc7872d27f724c840 -r2702ecf9aaf678cf869dc330f8ff560b3de4672a
--- Ringtoets/Common/src/Ringtoets.Common.Forms/Ringtoets.Common.Forms.csproj	(.../Ringtoets.Common.Forms.csproj)	(revision a7f920661887773056c051edc7872d27f724c840)
+++ Ringtoets/Common/src/Ringtoets.Common.Forms/Ringtoets.Common.Forms.csproj	(.../Ringtoets.Common.Forms.csproj)	(revision 2702ecf9aaf678cf869dc330f8ff560b3de4672a)
@@ -49,6 +49,7 @@
     <Compile Include="ChangeHandlers\ObservablePropertyChangeHandler.cs" />
     <Compile Include="ChangeHandlers\FailureMechanismPropertyChangeHandler.cs" />
     <Compile Include="ChangeHandlers\PropertyChangeHelper.cs" />
+    <Compile Include="ChangeHandlers\CalculationChangeHandler.cs" />
     <Compile Include="GuiServices\HydraulicBoundaryLocationCalculationGuiService.cs" />
     <Compile Include="GuiServices\IHydraulicBoundaryLocationCalculationGuiService.cs" />
     <Compile Include="Helpers\SelectableHydraulicBoundaryLocationHelper.cs" />
Index: Ringtoets/Common/test/Ringtoets.Common.Data.TestUtil/TestCalculation.cs
===================================================================
diff -u -rb3b6c13cf736c134476b3db34281332d01ca86b1 -r2702ecf9aaf678cf869dc330f8ff560b3de4672a
--- Ringtoets/Common/test/Ringtoets.Common.Data.TestUtil/TestCalculation.cs	(.../TestCalculation.cs)	(revision b3b6c13cf736c134476b3db34281332d01ca86b1)
+++ Ringtoets/Common/test/Ringtoets.Common.Data.TestUtil/TestCalculation.cs	(.../TestCalculation.cs)	(revision 2702ecf9aaf678cf869dc330f8ff560b3de4672a)
@@ -39,7 +39,7 @@
         }
 
         public string Name { get; set; }
-        public bool HasOutput { get; }
+        public bool HasOutput { get; set; }
         public Comment Comments { get; }
         public void ClearOutput() {}
     }
Index: Ringtoets/Common/test/Ringtoets.Common.Forms.Test/ChangeHandlers/CalculationChangeHandlerTest.cs
===================================================================
diff -u
--- Ringtoets/Common/test/Ringtoets.Common.Forms.Test/ChangeHandlers/CalculationChangeHandlerTest.cs	(revision 0)
+++ Ringtoets/Common/test/Ringtoets.Common.Forms.Test/ChangeHandlers/CalculationChangeHandlerTest.cs	(revision 2702ecf9aaf678cf869dc330f8ff560b3de4672a)
@@ -0,0 +1,184 @@
+// Copyright (C) Stichting Deltares 2017. All rights reserved.
+//
+// This file is part of Ringtoets.
+//
+// Ringtoets is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+//
+// All names, logos, and references to "Deltares" are registered trademarks of
+// Stichting Deltares and remain full property of Stichting Deltares at all times.
+// All rights reserved.
+
+using System;
+using System.Linq;
+using Core.Common.Gui;
+using NUnit.Framework;
+using Rhino.Mocks;
+using Ringtoets.Common.Data.Calculation;
+using Ringtoets.Common.Data.TestUtil;
+using Ringtoets.Common.Forms.ChangeHandlers;
+using Ringtoets.Common.IO;
+
+namespace Ringtoets.Common.Forms.Test.ChangeHandlers
+{
+    [TestFixture]
+    public class CalculationChangeHandlerTest
+    {
+        [Test]
+        public void Constructor_WithoutCalculations_ThrowsArgumentNullException()
+        {
+            // Setup
+            var mockRepository = new MockRepository();
+            var inquiryHandler = mockRepository.Stub<IInquiryHelper>();
+            mockRepository.ReplayAll();
+
+            // Call
+            TestDelegate test = () => new CalculationChangeHandler(null, string.Empty, inquiryHandler);
+
+            // Assert
+            string paramName = Assert.Throws<ArgumentNullException>(test).ParamName;
+            Assert.AreEqual("calculations", paramName);
+            mockRepository.VerifyAll();
+        }
+
+        [Test]
+        public void Constructor_WithoutInquiryHandler_ThrowsArgumentNullException()
+        {
+            // Call
+            TestDelegate test = () => new CalculationChangeHandler(Enumerable.Empty<ICalculation>(),
+                                                                   string.Empty,
+                                                                   null);
+
+            // Assert
+            string paramName = Assert.Throws<ArgumentNullException>(test).ParamName;
+            Assert.AreEqual("inquiryHandler", paramName);
+        }
+
+        [Test]
+        public void Constructor_WithoutQuery_ThrowsArgumentNullException()
+        {
+            // Setup
+            var mockRepository = new MockRepository();
+            var inquiryHandler = mockRepository.Stub<IInquiryHelper>();
+            mockRepository.ReplayAll();
+
+            // Call
+            TestDelegate test = () => new CalculationChangeHandler(Enumerable.Empty<ICalculation>(),
+                                                                   null,
+                                                                   inquiryHandler);
+
+            // Assert
+            string paramName = Assert.Throws<ArgumentNullException>(test).ParamName;
+            Assert.AreEqual("query", paramName);
+        }
+
+        [Test]
+        public void Constructor_WithParameters_ImplementsExpectedInterface()
+        {
+            // Setup
+            var mockRepository = new MockRepository();
+            var inquiryHandler = mockRepository.StrictMock<IInquiryHelper>();
+            mockRepository.ReplayAll();
+
+            // Call
+            var handler = new CalculationChangeHandler(Enumerable.Empty<ICalculation>(),
+                                                       string.Empty,
+                                                       inquiryHandler);
+
+            // Assert
+            Assert.IsInstanceOf<IConfirmDataChangeHandler>(handler);
+            mockRepository.VerifyAll();
+        }
+
+        [Test]
+        public void RequireConfirmation_WithAllCalculationsWithoutOutput_ReturnFalse()
+        {
+            // Setup
+            var mockRepository = new MockRepository();
+            var inquiryHandler = mockRepository.StrictMock<IInquiryHelper>();
+            mockRepository.ReplayAll();
+
+            var calculations = new[]
+            {
+                new TestCalculation("Test")
+            };
+
+            var handler = new CalculationChangeHandler(calculations,
+                                                       string.Empty,
+                                                       inquiryHandler);
+
+            // Call
+            bool requireConfirmation = handler.RequireConfirmation();
+
+            // Assert
+            Assert.IsFalse(requireConfirmation);
+            mockRepository.VerifyAll();
+        }
+
+        [Test]
+        public void RequireConfirmation_CalculationsWithOutput_ReturnTrue()
+        {
+            // Setup
+            var mockRepository = new MockRepository();
+            var inquiryHandler = mockRepository.StrictMock<IInquiryHelper>();
+            mockRepository.ReplayAll();
+
+            var calculations = new[]
+            {
+                new TestCalculation("Test 1")
+                {
+                    HasOutput = true
+                },
+                new TestCalculation("Test 2")
+            };
+
+            var handler = new CalculationChangeHandler(calculations,
+                                                       string.Empty,
+                                                       inquiryHandler);
+
+            // Call
+            bool requireConfirmation = handler.RequireConfirmation();
+
+            // Assert
+            Assert.IsTrue(requireConfirmation);
+            mockRepository.VerifyAll();
+        }
+
+        [Test]
+        [TestCase("I am a query", true)]
+        [TestCase("I am a query", false)]
+        [TestCase("", true)]
+        [TestCase("", false)]
+        [TestCase("     ", true)]
+        [TestCase("     ", false)]
+        public void InquireConfirmation_Always_ShowsConfirmationDialogReturnResultOfInquiry(string message, bool expectedResult)
+        {
+            // Setup
+            var mockRepository = new MockRepository();
+            var inquiryHandler = mockRepository.StrictMock<IInquiryHelper>();
+            inquiryHandler.Expect(ih => ih.InquireContinuation(message)).Return(expectedResult);
+            mockRepository.ReplayAll();
+
+            var handler = new CalculationChangeHandler(Enumerable.Empty<ICalculation>(),
+                                                       message,
+                                                       inquiryHandler);
+
+            // Call
+            bool result = handler.InquireConfirmation();
+
+            // Assert
+            Assert.AreEqual(expectedResult, result);
+            mockRepository.VerifyAll();
+        }
+    }
+}
\ No newline at end of file
Index: Ringtoets/Common/test/Ringtoets.Common.Forms.Test/Ringtoets.Common.Forms.Test.csproj
===================================================================
diff -u -ra7f920661887773056c051edc7872d27f724c840 -r2702ecf9aaf678cf869dc330f8ff560b3de4672a
--- Ringtoets/Common/test/Ringtoets.Common.Forms.Test/Ringtoets.Common.Forms.Test.csproj	(.../Ringtoets.Common.Forms.Test.csproj)	(revision a7f920661887773056c051edc7872d27f724c840)
+++ Ringtoets/Common/test/Ringtoets.Common.Forms.Test/Ringtoets.Common.Forms.Test.csproj	(.../Ringtoets.Common.Forms.Test.csproj)	(revision 2702ecf9aaf678cf869dc330f8ff560b3de4672a)
@@ -67,6 +67,7 @@
     <Compile Include="ChangeHandlers\ObservablePropertyChangeHandlerTest.cs" />
     <Compile Include="ChangeHandlers\FailureMechanismPropertyChangeHandlerTest.cs" />
     <Compile Include="ChangeHandlers\PropertyChangeHelperTest.cs" />
+    <Compile Include="ChangeHandlers\CalculationChangeHandlerTest.cs" />
     <Compile Include="ExportInfos\RingtoetsExportInfoFactoryTest.cs" />
     <Compile Include="GuiServices\HydraulicBoundaryLocationCalculationGuiServiceTest.cs" />
     <Compile Include="Helpers\NamingHelperTest.cs" />