Index: Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.IO/Configurations/ConfigurationTangentLineDeterminationType.cs
===================================================================
diff -u
--- Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.IO/Configurations/ConfigurationTangentLineDeterminationType.cs	(revision 0)
+++ Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.IO/Configurations/ConfigurationTangentLineDeterminationType.cs	(revision b1704785efb083ed440cff2afe2199db168fab07)
@@ -0,0 +1,33 @@
+// 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.
+
+namespace Ringtoets.MacroStabilityInwards.IO.Configurations
+{
+    /// <summary>
+    /// Defines the various tangent line determination types in a read calculation configuration.
+    /// </summary>
+    public enum ConfigurationTangentLineDeterminationType
+    {
+        Specified = 1,
+
+        LayerSeparated = 2
+    }
+}
\ No newline at end of file
Index: Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.IO/Configurations/Helpers/ConfigurationTangentLineDeterminationTypeConverter.cs
===================================================================
diff -u
--- Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.IO/Configurations/Helpers/ConfigurationTangentLineDeterminationTypeConverter.cs	(revision 0)
+++ Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.IO/Configurations/Helpers/ConfigurationTangentLineDeterminationTypeConverter.cs	(revision b1704785efb083ed440cff2afe2199db168fab07)
@@ -0,0 +1,71 @@
+// 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.ComponentModel;
+using System.Globalization;
+using Ringtoets.MacroStabilityInwards.Data;
+
+namespace Ringtoets.MacroStabilityInwards.IO.Configurations.Helpers
+{
+    /// <summary>
+    /// Converts <see cref="ConfigurationTangentLineDeterminationType"/> to <see cref="string"/> and back.
+    /// </summary>
+    public class ConfigurationTangentLineDeterminationTypeConverter : TypeConverter
+    {
+        public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
+        {
+            return destinationType == typeof(MacroStabilityInwardsTangentLineDeterminationType)
+                   || base.CanConvertTo(context, destinationType);
+        }
+
+        public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
+        {
+            if (destinationType == typeof(string))
+            {
+                var type = (ConfigurationTangentLineDeterminationType) value;
+                switch (type)
+                {
+                    case ConfigurationTangentLineDeterminationType.Specified:
+                        return MacroStabilityInwardsCalculationConfigurationSchemaIdentifiers.TangentLineDeterminationTypeSpecified;
+                    case ConfigurationTangentLineDeterminationType.LayerSeparated:
+                        return MacroStabilityInwardsCalculationConfigurationSchemaIdentifiers.TangentLineDeterminationTypeLayerSeparated;
+                    default:
+                        throw new NotSupportedException();
+                }
+            }
+            if (destinationType == typeof(MacroStabilityInwardsTangentLineDeterminationType))
+            {
+                var type = (ConfigurationTangentLineDeterminationType) value;
+                switch (type)
+                {
+                    case ConfigurationTangentLineDeterminationType.Specified:
+                        return MacroStabilityInwardsTangentLineDeterminationType.Specified;
+                    case ConfigurationTangentLineDeterminationType.LayerSeparated:
+                        return MacroStabilityInwardsTangentLineDeterminationType.LayerSeparated;
+                    default:
+                        throw new NotSupportedException();
+                }
+            }
+            return base.ConvertTo(context, culture, value, destinationType);
+        }
+    }
+}
\ No newline at end of file
Index: Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.IO/Configurations/MacroStabilityInwardsCalculationConfigurationSchemaIdentifiers.cs
===================================================================
diff -u -r12ccd3dc7621c2cfc790f71e2b49f7acfdce04e1 -rb1704785efb083ed440cff2afe2199db168fab07
--- Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.IO/Configurations/MacroStabilityInwardsCalculationConfigurationSchemaIdentifiers.cs	(.../MacroStabilityInwardsCalculationConfigurationSchemaIdentifiers.cs)	(revision 12ccd3dc7621c2cfc790f71e2b49f7acfdce04e1)
+++ Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.IO/Configurations/MacroStabilityInwardsCalculationConfigurationSchemaIdentifiers.cs	(.../MacroStabilityInwardsCalculationConfigurationSchemaIdentifiers.cs)	(revision b1704785efb083ed440cff2afe2199db168fab07)
@@ -19,6 +19,8 @@
 // Stichting Deltares and remain full property of Stichting Deltares at all times.
 // All rights reserved.
 
+using Ringtoets.MacroStabilityInwards.Data;
+
 namespace Ringtoets.MacroStabilityInwards.IO.Configurations
 {
     /// <summary>
@@ -45,5 +47,22 @@
         /// The identifier for stochastic soil profile elements.
         /// </summary>
         public const string StochasticSoilProfileElement = "ondergrondschematisatie";
+
+        /// <summary>
+        /// The identifier for the tangent line determination type elements.
+        /// </summary>
+        public const string TangentLineDeterminationTypeElement = "bepalingtangentlijnen";
+
+        /// <summary>
+        /// The possible content of the <see cref="MacroStabilityInwardsTangentLineDeterminationType"/> 
+        /// element indicating layer separated.
+        /// </summary>
+        public const string TangentLineDeterminationTypeLayerSeparated = "laagscheiding";
+
+        /// <summary>
+        /// The possible content of the <see cref="MacroStabilityInwardsTangentLineDeterminationType"/> 
+        /// element indicating specified.
+        /// </summary>
+        public const string TangentLineDeterminationTypeSpecified = "gespecificeerd";
     }
 }
\ No newline at end of file
Index: Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.IO/Ringtoets.MacroStabilityInwards.IO.csproj
===================================================================
diff -u -r39df1b649c1da3040e3786ab46db646a7fb2e089 -rb1704785efb083ed440cff2afe2199db168fab07
--- Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.IO/Ringtoets.MacroStabilityInwards.IO.csproj	(.../Ringtoets.MacroStabilityInwards.IO.csproj)	(revision 39df1b649c1da3040e3786ab46db646a7fb2e089)
+++ Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.IO/Ringtoets.MacroStabilityInwards.IO.csproj	(.../Ringtoets.MacroStabilityInwards.IO.csproj)	(revision b1704785efb083ed440cff2afe2199db168fab07)
@@ -35,6 +35,8 @@
     <Compile Include="..\..\..\..\Core\Common\src\Core.Common.Version\GlobalAssembly.cs">
       <Link>Properties\GlobalAssembly.cs</Link>
     </Compile>
+    <Compile Include="Configurations\ConfigurationTangentLineDeterminationType.cs" />
+    <Compile Include="Configurations\Helpers\ConfigurationTangentLineDeterminationTypeConverter.cs" />
     <Compile Include="Configurations\MacroStabilityInwardsCalculationConfigurationExporter.cs" />
     <Compile Include="Configurations\MacroStabilityInwardsCalculationConfigurationWriter.cs" />
     <Compile Include="Configurations\MacroStabilityInwardsCalculationConfigurationImporter.cs" />
Index: Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.IO.Test/Configurations/Helpers/ConfigurationTangentLineDeterminationTypeConverterTest.cs
===================================================================
diff -u
--- Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.IO.Test/Configurations/Helpers/ConfigurationTangentLineDeterminationTypeConverterTest.cs	(revision 0)
+++ Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.IO.Test/Configurations/Helpers/ConfigurationTangentLineDeterminationTypeConverterTest.cs	(revision b1704785efb083ed440cff2afe2199db168fab07)
@@ -0,0 +1,155 @@
+// 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.ComponentModel;
+using NUnit.Framework;
+using Ringtoets.MacroStabilityInwards.Data;
+using Ringtoets.MacroStabilityInwards.IO.Configurations;
+using Ringtoets.MacroStabilityInwards.IO.Configurations.Helpers;
+
+namespace Ringtoets.MacroStabilityInwards.IO.Test.Configurations.Helpers
+{
+    [TestFixture]
+    public class ConfigurationTangentLineDeterminationTypeConverterTest
+    {
+        [Test]
+        public void Constructor_ExpectedValues()
+        {
+            // Call
+            var converter = new ConfigurationTangentLineDeterminationTypeConverter();
+
+            // Assert
+            Assert.IsInstanceOf<TypeConverter>(converter);
+        }
+
+        [Test]
+        [TestCaseSource(nameof(GetConvertToSupportedTypes))]
+        public void CanConvertTo_String_ReturnTrue(Type supportedType)
+        {
+            // Setup
+            var converter = new ConfigurationTangentLineDeterminationTypeConverter();
+
+            // Call
+            bool convertTo = converter.CanConvertTo(supportedType);
+
+            // Assert
+            Assert.IsTrue(convertTo);
+        }
+
+        [Test]
+        public void CanConvertTo_OtherType_ReturnFalse()
+        {
+            // Setup
+            var converter = new ConfigurationTangentLineDeterminationTypeConverter();
+
+            // Call
+            bool convertTo = converter.CanConvertTo(typeof(object));
+
+            // Assert
+            Assert.IsFalse(convertTo);
+        }
+
+        [Test]
+        [TestCaseSource(nameof(SupporterConvertions), new object[]
+        {
+            "ConvertTo_{2}_Returns{1}"
+        })]
+        public void ConvertTo_VariousCases_ReturnExpectedResult(ConfigurationTangentLineDeterminationType value,
+                                                                Type convertToType,
+                                                                object expectedResult)
+        {
+            // Setup
+            var converter = new ConfigurationTangentLineDeterminationTypeConverter();
+
+            // Call
+            object result = converter.ConvertTo(value, convertToType);
+
+            // Assert
+            Assert.AreEqual(expectedResult, result);
+        }
+
+        [Test]
+        [TestCaseSource(nameof(InvalidConvertions), new object[]
+        {
+            "ConvertTo_Convert{2}to{1}_ThrowsNotSupportedException"
+        })]
+        public void ConvertTo_Invalid_ThrowsNotSupportedException(ConfigurationTangentLineDeterminationType invalidValue,
+                                                                  Type convertToType)
+        {
+            // Setup
+            var converter = new ConfigurationTangentLineDeterminationTypeConverter();
+            ;
+
+            // Call
+            TestDelegate call = () => converter.ConvertTo(invalidValue, convertToType);
+
+            // Assert
+            Assert.Throws<NotSupportedException>(call);
+        }
+
+        private static IEnumerable<TestCaseData> GetConvertToSupportedTypes()
+        {
+            const string testName = "CanConvertTo_{0}_ReturnTrue";
+
+            yield return new TestCaseData(typeof(string))
+                .SetName(testName);
+            yield return new TestCaseData(typeof(MacroStabilityInwardsTangentLineDeterminationType))
+                .SetName(testName);
+        }
+
+        private static IEnumerable<TestCaseData> SupporterConvertions(string testName)
+        {
+            Type stringType = typeof(string);
+            Type tangentLineDeterminationType = typeof(MacroStabilityInwardsTangentLineDeterminationType);
+
+            yield return new TestCaseData(ConfigurationTangentLineDeterminationType.LayerSeparated,
+                                          stringType,
+                                          MacroStabilityInwardsCalculationConfigurationSchemaIdentifiers.TangentLineDeterminationTypeLayerSeparated)
+                .SetName(testName);
+            yield return new TestCaseData(ConfigurationTangentLineDeterminationType.Specified,
+                                          stringType,
+                                          MacroStabilityInwardsCalculationConfigurationSchemaIdentifiers.TangentLineDeterminationTypeSpecified)
+                .SetName(testName);
+
+            yield return new TestCaseData(ConfigurationTangentLineDeterminationType.LayerSeparated,
+                                          tangentLineDeterminationType,
+                                          MacroStabilityInwardsTangentLineDeterminationType.LayerSeparated)
+                .SetName(testName);
+            yield return new TestCaseData(ConfigurationTangentLineDeterminationType.Specified,
+                                          tangentLineDeterminationType,
+                                          MacroStabilityInwardsTangentLineDeterminationType.Specified)
+                .SetName(testName);
+        }
+
+        private static IEnumerable<TestCaseData> InvalidConvertions(string testName)
+        {
+            yield return new TestCaseData((ConfigurationTangentLineDeterminationType) 99999,
+                                          typeof(string))
+                .SetName(testName);
+
+            yield return new TestCaseData((ConfigurationTangentLineDeterminationType) 99999,
+                                          typeof(MacroStabilityInwardsTangentLineDeterminationType))
+                .SetName(testName);
+        }
+    }
+}
\ No newline at end of file
Index: Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.IO.Test/Configurations/MacroStabilityInwardsCalculationConfigurationSchemaIdentifiersTest.cs
===================================================================
diff -u -rf03b47d0d73983de35188874a094ae07f1ea13fa -rb1704785efb083ed440cff2afe2199db168fab07
--- Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.IO.Test/Configurations/MacroStabilityInwardsCalculationConfigurationSchemaIdentifiersTest.cs	(.../MacroStabilityInwardsCalculationConfigurationSchemaIdentifiersTest.cs)	(revision f03b47d0d73983de35188874a094ae07f1ea13fa)
+++ Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.IO.Test/Configurations/MacroStabilityInwardsCalculationConfigurationSchemaIdentifiersTest.cs	(.../MacroStabilityInwardsCalculationConfigurationSchemaIdentifiersTest.cs)	(revision b1704785efb083ed440cff2afe2199db168fab07)
@@ -34,6 +34,9 @@
             Assert.AreEqual("profielschematisatie", MacroStabilityInwardsCalculationConfigurationSchemaIdentifiers.SurfaceLineElement);
             Assert.AreEqual("ondergrondmodel", MacroStabilityInwardsCalculationConfigurationSchemaIdentifiers.StochasticSoilModelElement);
             Assert.AreEqual("ondergrondschematisatie", MacroStabilityInwardsCalculationConfigurationSchemaIdentifiers.StochasticSoilProfileElement);
+            Assert.AreEqual("bepalingtangentlijnen", MacroStabilityInwardsCalculationConfigurationSchemaIdentifiers.TangentLineDeterminationTypeElement);
+            Assert.AreEqual("laagscheiding", MacroStabilityInwardsCalculationConfigurationSchemaIdentifiers.TangentLineDeterminationTypeLayerSeparated);
+            Assert.AreEqual("gespecificeerd", MacroStabilityInwardsCalculationConfigurationSchemaIdentifiers.TangentLineDeterminationTypeSpecified);
         }
     }
 }
\ No newline at end of file
Index: Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.IO.Test/Ringtoets.MacroStabilityInwards.IO.Test.csproj
===================================================================
diff -u -r94fbe0ddb5936201eaffc5bab789a39ee7a245ef -rb1704785efb083ed440cff2afe2199db168fab07
--- Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.IO.Test/Ringtoets.MacroStabilityInwards.IO.Test.csproj	(.../Ringtoets.MacroStabilityInwards.IO.Test.csproj)	(revision 94fbe0ddb5936201eaffc5bab789a39ee7a245ef)
+++ Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.IO.Test/Ringtoets.MacroStabilityInwards.IO.Test.csproj	(.../Ringtoets.MacroStabilityInwards.IO.Test.csproj)	(revision b1704785efb083ed440cff2afe2199db168fab07)
@@ -58,6 +58,7 @@
     <Compile Include="..\..\..\..\Core\Common\src\Core.Common.Version\GlobalAssembly.cs">
       <Link>Properties\GlobalAssembly.cs</Link>
     </Compile>
+    <Compile Include="Configurations\Helpers\ConfigurationTangentLineDeterminationTypeConverterTest.cs" />
     <Compile Include="Configurations\MacroStabilityInwardsCalculationConfigurationExporterTest.cs" />
     <Compile Include="Configurations\MacroStabilityInwardsCalculationConfigurationWriterTest.cs" />
     <Compile Include="Configurations\MacroStabilityInwardsCalculationConfigurationImporterTest.cs" />