Index: Ringtoets/DuneErosion/test/Ringtoets.DuneErosion.IO.Test/DuneLocationsWriterTest.cs
===================================================================
diff -u -ra8aca94d54270b32b12d2e6810e5ef21824130e7 -raa08f3d944eb8f045be344a6c062b1df32cb7cfa
--- Ringtoets/DuneErosion/test/Ringtoets.DuneErosion.IO.Test/DuneLocationsWriterTest.cs	(.../DuneLocationsWriterTest.cs)	(revision a8aca94d54270b32b12d2e6810e5ef21824130e7)
+++ Ringtoets/DuneErosion/test/Ringtoets.DuneErosion.IO.Test/DuneLocationsWriterTest.cs	(.../DuneLocationsWriterTest.cs)	(revision aa08f3d944eb8f045be344a6c062b1df32cb7cfa)
@@ -61,7 +61,7 @@
         [TestCase("")]
         [TestCase("   ")]
         [TestCase("c:\\>")]
-        public void WriteWaveConditions_FilePathInvalid_ThrowCriticalFileWriteException(string filePath)
+        public void WriteDuneLocations_FilePathInvalid_ThrowCriticalFileWriteException(string filePath)
         {
             // Call
             TestDelegate call = () => DuneLocationsWriter.WriteDuneLocations(Enumerable.Empty<DuneLocation>(), filePath);
Index: Ringtoets/Piping/src/Ringtoets.Piping.IO/Exporters/CalculationGroupWriter.cs
===================================================================
diff -u
--- Ringtoets/Piping/src/Ringtoets.Piping.IO/Exporters/CalculationGroupWriter.cs	(revision 0)
+++ Ringtoets/Piping/src/Ringtoets.Piping.IO/Exporters/CalculationGroupWriter.cs	(revision aa08f3d944eb8f045be344a6c062b1df32cb7cfa)
@@ -0,0 +1,66 @@
+// Copyright (C) Stichting Deltares 2016. 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.Xml;
+using Core.Common.IO.Exceptions;
+using Ringtoets.Common.Data.Calculation;
+using CoreCommonUtilsResources = Core.Common.Utils.Properties.Resources;
+
+namespace Ringtoets.Piping.IO.Exporters
+{
+    /// <summary>
+    /// Xml file writer for writing <see cref="CalculationGroup"/> objects to *.xml file.
+    /// </summary>
+    internal static class CalculationGroupWriter
+    {
+        /// <summary>
+        /// Writes the calculation group to a xml file.
+        /// </summary>
+        /// <param name="rootCalculationGroup">The root calculation group to be written to the file.</param>
+        /// <param name="filePath">The path to the file.</param>
+        /// <exception cref="ArgumentNullException">Thrown when any parameter is <c>null</c>.</exception>
+        /// <exception cref="CriticalFileWriteException">Thrown when unable to write to <paramref name="filePath"/>.</exception>
+        internal static void WriteCalculationGroups(CalculationGroup rootCalculationGroup, string filePath)
+        {
+            if (rootCalculationGroup == null)
+            {
+                throw new ArgumentNullException(nameof(rootCalculationGroup));
+            }
+            if (filePath == null)
+            {
+                throw new ArgumentNullException(nameof(filePath));
+            }
+
+            try
+            {
+                using (XmlWriter writer = XmlWriter.Create(filePath))
+                {
+                    
+                }
+            }
+            catch (SystemException e)
+            {
+                throw new CriticalFileWriteException(string.Format(CoreCommonUtilsResources.Error_General_output_error_0, filePath), e);
+            }
+        }
+    }
+}
\ No newline at end of file
Index: Ringtoets/Piping/src/Ringtoets.Piping.IO/Ringtoets.Piping.IO.csproj
===================================================================
diff -u -r316e741c3eefe3aab13dd070b56654a6bc4c24f1 -raa08f3d944eb8f045be344a6c062b1df32cb7cfa
--- Ringtoets/Piping/src/Ringtoets.Piping.IO/Ringtoets.Piping.IO.csproj	(.../Ringtoets.Piping.IO.csproj)	(revision 316e741c3eefe3aab13dd070b56654a6bc4c24f1)
+++ Ringtoets/Piping/src/Ringtoets.Piping.IO/Ringtoets.Piping.IO.csproj	(.../Ringtoets.Piping.IO.csproj)	(revision aa08f3d944eb8f045be344a6c062b1df32cb7cfa)
@@ -52,6 +52,7 @@
     <Compile Include="Builders\SoilProfileBuilder2D.cs" />
     <Compile Include="Builders\SoilDatabaseQueryBuilder.cs" />
     <Compile Include="Exceptions\StochasticSoilProfileReadException.cs" />
+    <Compile Include="Exporters\CalculationGroupWriter.cs" />
     <Compile Include="Importer\IStochasticSoilModelChangeHandler.cs" />
     <Compile Include="Importer\IStochasticSoilModelUpdateModelStrategy.cs" />
     <Compile Include="Importer\ISurfaceLineUpdateSurfaceLineStrategy.cs" />
@@ -100,6 +101,11 @@
       <Name>Core.Common.Utils</Name>
       <Private>False</Private>
     </ProjectReference>
+    <ProjectReference Include="..\..\..\Common\src\Ringtoets.Common.Data\Ringtoets.Common.Data.csproj">
+      <Project>{D4200F43-3F72-4F42-AF0A-8CED416A38EC}</Project>
+      <Name>Ringtoets.Common.Data</Name>
+      <Private>False</Private>
+    </ProjectReference>
     <ProjectReference Include="..\..\..\Common\src\Ringtoets.Common.IO\Ringtoets.Common.IO.csproj">
       <Project>{52ba7627-cbab-4209-be77-3b5f31378277}</Project>
       <Name>Ringtoets.Common.IO</Name>
@@ -153,6 +159,7 @@
     </None>
     <None Include="packages.config" />
   </ItemGroup>
+  <ItemGroup />
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <PropertyGroup>
     <PreBuildEvent>
Index: Ringtoets/Piping/test/Ringtoets.Piping.IO.Test/Exporters/CalculationGroupWriterTest.cs
===================================================================
diff -u
--- Ringtoets/Piping/test/Ringtoets.Piping.IO.Test/Exporters/CalculationGroupWriterTest.cs	(revision 0)
+++ Ringtoets/Piping/test/Ringtoets.Piping.IO.Test/Exporters/CalculationGroupWriterTest.cs	(revision aa08f3d944eb8f045be344a6c062b1df32cb7cfa)
@@ -0,0 +1,116 @@
+// Copyright (C) Stichting Deltares 2016. 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.IO;
+using System.Security.AccessControl;
+using Core.Common.IO.Exceptions;
+using Core.Common.TestUtil;
+using NUnit.Framework;
+using Ringtoets.Common.Data.Calculation;
+using Ringtoets.Piping.IO.Exporters;
+
+namespace Ringtoets.Piping.IO.Test.Exporters
+{
+    [TestFixture]
+    public class CalculationGroupWriterTest
+    {
+        [Test]
+        public void WriteCalculationGroups_CalculationGroupNull_ThrowArgumentNullException()
+        {
+            // Call
+            TestDelegate test = () => CalculationGroupWriter.WriteCalculationGroups(null, string.Empty);
+
+            // Assert
+            var exception = Assert.Throws<ArgumentNullException>(test);
+            Assert.AreEqual("rootCalculationGroup", exception.ParamName);
+        }
+
+        [Test]
+        public void WriteCalculationGroups_FilePathNull_ThrowArgumentNullException()
+        {
+            // Call
+            TestDelegate test = () => CalculationGroupWriter.WriteCalculationGroups(new CalculationGroup(), null);
+
+            // Assert
+            var exception = Assert.Throws<ArgumentNullException>(test);
+            Assert.AreEqual("filePath", exception.ParamName);
+        }
+
+        [Test]
+        [TestCase("")]
+        [TestCase("   ")]
+        [TestCase("c:\\>")]
+        public void WriteCalculationGroups_FilePathInvalid_ThrowCriticalFileWriteException(string filePath)
+        {
+            // Call
+            TestDelegate call = () => CalculationGroupWriter.WriteCalculationGroups(new CalculationGroup(), filePath);
+
+            // Assert
+            var exception = Assert.Throws<CriticalFileWriteException>(call);
+            Assert.AreEqual($"Er is een onverwachte fout opgetreden tijdens het schrijven van het bestand '{filePath}'.", exception.Message);
+            Assert.IsInstanceOf<ArgumentException>(exception.InnerException);
+        }
+
+        [Test]
+        public void WriteCalculationGroups_FilePathTooLong_ThrowCriticalFileWriteException()
+        {
+            // Setup
+            var filePath = new string('a', 249);
+
+            // Call
+            TestDelegate call = () => CalculationGroupWriter.WriteCalculationGroups(new CalculationGroup(), filePath);
+
+            // Assert
+            var exception = Assert.Throws<CriticalFileWriteException>(call);
+            Assert.AreEqual($"Er is een onverwachte fout opgetreden tijdens het schrijven van het bestand '{filePath}'.", exception.Message);
+            Assert.IsInstanceOf<PathTooLongException>(exception.InnerException);
+        }
+
+        [Test]
+        public void WriteCalculationGroups_InvalidDirectoryRights_ThrowCriticalFileWriteException()
+        {
+            // Setup
+            string directoryPath = TestHelper.GetTestDataPath(TestDataPath.Ringtoets.Piping.IO,
+                                                              "WriteCalculationGroups_InvalidDirectoryRights_ThrowCriticalFileWriteException");
+            Directory.CreateDirectory(directoryPath);
+            string filePath = Path.Combine(directoryPath, "test.xml");
+
+            // Call
+            TestDelegate call = () => CalculationGroupWriter.WriteCalculationGroups(new CalculationGroup(), filePath);
+
+            try
+            {
+                using (new DirectoryPermissionsRevoker(directoryPath, FileSystemRights.Write))
+                {
+                    // Assert
+                    var exception = Assert.Throws<CriticalFileWriteException>(call);
+                    Assert.AreEqual($"Er is een onverwachte fout opgetreden tijdens het schrijven van het bestand '{filePath}'.", exception.Message);
+                    Assert.IsInstanceOf<UnauthorizedAccessException>(exception.InnerException);
+                }
+            }
+            finally
+            {
+                Directory.Delete(directoryPath, true);
+            }
+        }
+    }
+}
\ No newline at end of file
Index: Ringtoets/Piping/test/Ringtoets.Piping.IO.Test/Ringtoets.Piping.IO.Test.csproj
===================================================================
diff -u -ra59b471e3b6a02319f91b7317b3814a099ef0221 -raa08f3d944eb8f045be344a6c062b1df32cb7cfa
--- Ringtoets/Piping/test/Ringtoets.Piping.IO.Test/Ringtoets.Piping.IO.Test.csproj	(.../Ringtoets.Piping.IO.Test.csproj)	(revision a59b471e3b6a02319f91b7317b3814a099ef0221)
+++ Ringtoets/Piping/test/Ringtoets.Piping.IO.Test/Ringtoets.Piping.IO.Test.csproj	(.../Ringtoets.Piping.IO.Test.csproj)	(revision aa08f3d944eb8f045be344a6c062b1df32cb7cfa)
@@ -72,6 +72,7 @@
     <Compile Include="Builders\SoilProfileBuilderExceptionTest.cs" />
     <Compile Include="Builders\SoilDatabaseQueryBuilderTest.cs" />
     <Compile Include="Exceptions\StochasticSoilProfileReadExceptionTest.cs" />
+    <Compile Include="Exporters\CalculationGroupWriterTest.cs" />
     <Compile Include="SoilProfile\LayerPropertiesTest.cs" />
     <Compile Include="SoilProfile\SoilLayerColorConversionHelperTest.cs" />
     <Compile Include="SoilProfile\StochasticSoilModelReaderTest.cs" />