Index: Application/Ringtoets/src/Application.Ringtoets.Migration/Application.Ringtoets.Migration.csproj
===================================================================
diff -u -r3c04633ccf2eacbc1e0dc2db5a2a381080c3a035 -r5ec759496df2662a183c1c5ed74e3724bd834ae2
--- Application/Ringtoets/src/Application.Ringtoets.Migration/Application.Ringtoets.Migration.csproj	(.../Application.Ringtoets.Migration.csproj)	(revision 3c04633ccf2eacbc1e0dc2db5a2a381080c3a035)
+++ Application/Ringtoets/src/Application.Ringtoets.Migration/Application.Ringtoets.Migration.csproj	(.../Application.Ringtoets.Migration.csproj)	(revision 5ec759496df2662a183c1c5ed74e3724bd834ae2)
@@ -64,6 +64,11 @@
     </EmbeddedResource>
   </ItemGroup>
   <ItemGroup>
+    <ProjectReference Include="..\..\..\..\Core\Common\src\Core.Common.Base\Core.Common.Base.csproj">
+      <Project>{3bbfd65b-b277-4e50-ae6d-bd24c3434609}</Project>
+      <Name>Core.Common.Base</Name>
+      <Private>False</Private>
+    </ProjectReference>
     <ProjectReference Include="..\..\..\..\Core\Common\src\Core.Common.Gui\Core.Common.Gui.csproj">
       <Project>{30e4c2ae-719e-4d70-9fa9-668a9767fbfa}</Project>
       <Name>Core.Common.Gui</Name>
Index: Application/Ringtoets/src/Application.Ringtoets.Migration/RingtoetsProjectMigrator.cs
===================================================================
diff -u -rb6d487f36edb7b6ca133a0e26d1ab7bda4c6bab6 -r5ec759496df2662a183c1c5ed74e3724bd834ae2
--- Application/Ringtoets/src/Application.Ringtoets.Migration/RingtoetsProjectMigrator.cs	(.../RingtoetsProjectMigrator.cs)	(revision b6d487f36edb7b6ca133a0e26d1ab7bda4c6bab6)
+++ Application/Ringtoets/src/Application.Ringtoets.Migration/RingtoetsProjectMigrator.cs	(.../RingtoetsProjectMigrator.cs)	(revision 5ec759496df2662a183c1c5ed74e3724bd834ae2)
@@ -24,6 +24,7 @@
 using System.Windows.Forms;
 using Application.Ringtoets.Migration.Core;
 using Application.Ringtoets.Migration.Properties;
+using Core.Common.Base.Storage;
 using Core.Common.Gui;
 using Core.Common.Utils;
 using log4net;
@@ -37,7 +38,7 @@
     /// <summary>
     /// A GUI implementation to migrate a Ringtoets database file to a newer version.
     /// </summary>
-    public class RingtoetsProjectMigrator
+    public class RingtoetsProjectMigrator : IMigrateProject
     {
         private static readonly string currentProjectVersion = RingtoetsVersionHelper.GetCurrentDatabaseVersion();
 
@@ -63,18 +64,6 @@
                                                  Resources.RingtoetsProject_FileExtension);
         }
 
-        /// <summary>
-        /// Indicates if the project <paramref name="sourceFilePath"/> needs to be 
-        /// updated to the newest version.
-        /// </summary>
-        /// <param name="sourceFilePath">The file path of the project which needs to be checked.</param>
-        /// <returns><c>true</c> if the file needs to be migrated, <c>false</c> if:</returns>
-        /// <list type="bullet">
-        /// <item>The file does not need to be migrated.</item>
-        /// <item>The file is not supported for the migration.</item>
-        /// </list>
-        /// <exception cref="ArgumentNullException">Thrown when <paramref name="sourceFilePath"/> is <c>null</c>.</exception>
-        /// <exception cref="ArgumentException">Thrown when <paramref name="sourceFilePath"/> is an invalid file path.</exception>
         public bool ShouldMigrate(string sourceFilePath)
         {
             if (sourceFilePath == null)
@@ -102,18 +91,6 @@
             return isVersionSupported;
         }
 
-        /// <summary>
-        /// Migrates an outdated project file from <paramref name="sourceFilePath"/>
-        /// to the newest project version version at a user defined target filepath.
-        /// </summary>
-        /// <param name="sourceFilePath">The project file which needs to be migrated.</param>
-        /// <returns>A filepath to the updated project file. <c>null</c> if:
-        /// <list type="bullet">
-        /// <item>The user cancelled.</item>
-        /// <item>The migration failed.</item>
-        /// </list></returns>
-        /// <exception cref="ArgumentNullException">Thrown when <see cref="sourceFilePath"/> is <c>null</c>.</exception>
-        /// <exception cref="ArgumentException">Thrown when <see cref="sourceFilePath"/> is an invalid file path.</exception>
         public string Migrate(string sourceFilePath)
         {
             if (sourceFilePath == null)
Index: Application/Ringtoets/test/Application.Ringtoets.Migration.Test/Application.Ringtoets.Migration.Test.csproj
===================================================================
diff -u -rb6d487f36edb7b6ca133a0e26d1ab7bda4c6bab6 -r5ec759496df2662a183c1c5ed74e3724bd834ae2
--- Application/Ringtoets/test/Application.Ringtoets.Migration.Test/Application.Ringtoets.Migration.Test.csproj	(.../Application.Ringtoets.Migration.Test.csproj)	(revision b6d487f36edb7b6ca133a0e26d1ab7bda4c6bab6)
+++ Application/Ringtoets/test/Application.Ringtoets.Migration.Test/Application.Ringtoets.Migration.Test.csproj	(.../Application.Ringtoets.Migration.Test.csproj)	(revision 5ec759496df2662a183c1c5ed74e3724bd834ae2)
@@ -64,6 +64,10 @@
     <None Include="packages.config" />
   </ItemGroup>
   <ItemGroup>
+    <ProjectReference Include="..\..\..\..\Core\Common\src\Core.Common.Base\Core.Common.Base.csproj">
+      <Project>{3BBFD65B-B277-4E50-AE6D-BD24C3434609}</Project>
+      <Name>Core.Common.Base</Name>
+    </ProjectReference>
     <ProjectReference Include="..\..\..\..\Core\Common\src\Core.Common.Gui\Core.Common.Gui.csproj">
       <Project>{30E4C2AE-719E-4D70-9FA9-668A9767FBFA}</Project>
       <Name>Core.Common.Gui</Name>
Index: Application/Ringtoets/test/Application.Ringtoets.Migration.Test/RingtoetsProjectMigratorTest.cs
===================================================================
diff -u -rb6d487f36edb7b6ca133a0e26d1ab7bda4c6bab6 -r5ec759496df2662a183c1c5ed74e3724bd834ae2
--- Application/Ringtoets/test/Application.Ringtoets.Migration.Test/RingtoetsProjectMigratorTest.cs	(.../RingtoetsProjectMigratorTest.cs)	(revision b6d487f36edb7b6ca133a0e26d1ab7bda4c6bab6)
+++ Application/Ringtoets/test/Application.Ringtoets.Migration.Test/RingtoetsProjectMigratorTest.cs	(.../RingtoetsProjectMigratorTest.cs)	(revision 5ec759496df2662a183c1c5ed74e3724bd834ae2)
@@ -24,6 +24,7 @@
 using System.Linq;
 using System.Threading;
 using Application.Ringtoets.Migration.Core;
+using Core.Common.Base.Storage;
 using Core.Common.Gui;
 using Core.Common.TestUtil;
 using NUnit.Extensions.Forms;
@@ -61,8 +62,7 @@
             var migrator = new RingtoetsProjectMigrator(inquiryHelper);
 
             // Assert
-            // TODO: introduce the IMigrateProject in Core.Common.Base
-            Assert.IsInstanceOf<object>(migrator);
+            Assert.IsInstanceOf<IMigrateProject>(migrator);
 
             mocks.VerifyAll();
         }
@@ -238,7 +238,7 @@
             string sourceFilePath = TestHelper.GetTestDataPath(TestDataPath.Application.Ringtoets.Migration, "FullTestProject164.rtd");
 
             string targetFile = $"{nameof(GivenMigratorAndSupportedFile_WhenContinuedAfterInquiryAndValidTargetLocationGivenWithoutExtension_ThenFileSuccessFullyMigratesAndExtensionAdded)}";
-            string targetFilePath = TestHelper.GetScratchPadPath(Path.Combine(testDirectory, targetFile));
+            string targetFilePath = Path.Combine(TestHelper.GetScratchPadPath(), testDirectory, targetFile);
             string expectedVersion = RingtoetsVersionHelper.GetCurrentDatabaseVersion();
 
             var mocks = new MockRepository();
@@ -286,7 +286,7 @@
             string sourceFilePath = TestHelper.GetTestDataPath(TestDataPath.Application.Ringtoets.Migration, "FullTestProject164.rtd");
 
             string targetFile = $"{nameof(GivenMigratorAndSupportedFile_WhenContinuedAfterInquiryAndValidTargetLocationGiven_ThenFileSuccessFullyMigrates)}.rtd";
-            string targetFilePath = TestHelper.GetScratchPadPath(Path.Combine(testDirectory, targetFile));
+            string targetFilePath = Path.Combine(TestHelper.GetScratchPadPath(), testDirectory, targetFile);
             string expectedVersion = RingtoetsVersionHelper.GetCurrentDatabaseVersion();
 
             var mocks = new MockRepository();
@@ -398,7 +398,7 @@
             // Setup
             string sourceFilePath = TestHelper.GetTestDataPath(TestDataPath.Application.Ringtoets.Migration, "UnsupportedVersion8.rtd");
             string targetFile = $"{nameof(Migrate_UnsupportedSourceFileVersion_ThenLogsError)}";
-            string targetFilePath = TestHelper.GetScratchPadPath(Path.Combine(testDirectory, targetFile));
+            string targetFilePath = Path.Combine(TestHelper.GetScratchPadPath(), testDirectory, targetFile);
 
             var mocks = new MockRepository();
             var inquiryHelper = mocks.StrictMock<IInquiryHelper>();
Index: Core/Common/src/Core.Common.Base/Core.Common.Base.csproj
===================================================================
diff -u -r66b07e7599319ea71ff109d8303f74a4a2e5f71c -r5ec759496df2662a183c1c5ed74e3724bd834ae2
--- Core/Common/src/Core.Common.Base/Core.Common.Base.csproj	(.../Core.Common.Base.csproj)	(revision 66b07e7599319ea71ff109d8303f74a4a2e5f71c)
+++ Core/Common/src/Core.Common.Base/Core.Common.Base.csproj	(.../Core.Common.Base.csproj)	(revision 5ec759496df2662a183c1c5ed74e3724bd834ae2)
@@ -106,6 +106,7 @@
     <Compile Include="Observer.cs" />
     <Compile Include="RecursiveObserver.cs" />
     <Compile Include="ObservableUniqueItemCollectionWithSourcePath.cs" />
+    <Compile Include="Storage\IMigrateProject.cs" />
     <Compile Include="Storage\StorageException.cs" />
     <Compile Include="Storage\StorageValidationException.cs" />
     <Compile Include="Storage\CouldNotConnectException.cs" />
Index: Core/Common/src/Core.Common.Base/Storage/IMigrateProject.cs
===================================================================
diff -u
--- Core/Common/src/Core.Common.Base/Storage/IMigrateProject.cs	(revision 0)
+++ Core/Common/src/Core.Common.Base/Storage/IMigrateProject.cs	(revision 5ec759496df2662a183c1c5ed74e3724bd834ae2)
@@ -0,0 +1,59 @@
+// 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 Lesser 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 Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser 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;
+
+namespace Core.Common.Base.Storage
+{
+    /// <summary>
+    /// Interface that describes the methods that need to be implemented on classes that provide a storage for projects.
+    /// </summary>
+    public interface IMigrateProject
+    {
+        /// <summary>
+        /// Indicates if the project from <paramref name="sourceFilePath"/> needs to be 
+        /// updated to the newest version.
+        /// </summary>
+        /// <param name="sourceFilePath">The file path of the project which needs to be checked.</param>
+        /// <returns><c>true</c> if the file needs to be migrated, <c>false</c> if:
+        /// <list type="bullet">
+        /// <item>The file does not need to be migrated.</item>
+        /// <item>The file is not supported for the migration.</item>
+        /// </list></returns>
+        /// <exception cref="ArgumentNullException">Thrown when <paramref name="sourceFilePath"/> is <c>null</c>.</exception>
+        /// <exception cref="ArgumentException">Thrown when <paramref name="sourceFilePath"/> is an invalid file path.</exception>
+        bool ShouldMigrate(string sourceFilePath);
+
+        /// <summary>
+        /// Migrates an outdated project file from <paramref name="sourceFilePath"/>
+        /// to the newest project version version at a user defined target filepath.
+        /// </summary>
+        /// <param name="sourceFilePath">The project file which needs to be migrated.</param>
+        /// <returns>A filepath to the updated project file. <c>null</c> if:
+        /// <list type="bullet">
+        /// <item>The user cancelled.</item>
+        /// <item>The migration failed.</item>
+        /// </list></returns>
+        /// <exception cref="ArgumentNullException">Thrown when <see cref="sourceFilePath"/> is <c>null</c>.</exception>
+        /// <exception cref="ArgumentException">Thrown when <see cref="sourceFilePath"/> is an invalid file path.</exception>
+        string Migrate(string sourceFilePath);
+    }
+}