Index: Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.KernelWrapper/SubCalculator/IUpliftVanCalculator.cs
===================================================================
diff -u -r0e9146a3375e69a172409554b934db2cc14b3f84 -r1f741e6208690a17217cea730557aa10f09bd8ec
--- Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.KernelWrapper/SubCalculator/IUpliftVanCalculator.cs	(.../IUpliftVanCalculator.cs)	(revision 0e9146a3375e69a172409554b934db2cc14b3f84)
+++ Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.KernelWrapper/SubCalculator/IUpliftVanCalculator.cs	(.../IUpliftVanCalculator.cs)	(revision 1f741e6208690a17217cea730557aa10f09bd8ec)
@@ -119,7 +119,7 @@
         /// <summary>
         /// Gets the sliding curve.
         /// </summary>
-        SlidingCurve SlidingCurve { get; }
+        SlidingDualCircle SlidingCurve { get; }
 
         /// <summary>
         /// Gets the slip plane.
Index: Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.KernelWrapper/SubCalculator/UpliftVanCalculator.cs
===================================================================
diff -u -r0e9146a3375e69a172409554b934db2cc14b3f84 -r1f741e6208690a17217cea730557aa10f09bd8ec
--- Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.KernelWrapper/SubCalculator/UpliftVanCalculator.cs	(.../UpliftVanCalculator.cs)	(revision 0e9146a3375e69a172409554b934db2cc14b3f84)
+++ Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.KernelWrapper/SubCalculator/UpliftVanCalculator.cs	(.../UpliftVanCalculator.cs)	(revision 1f741e6208690a17217cea730557aa10f09bd8ec)
@@ -176,7 +176,7 @@
 
         public bool ForbiddenZonesAutomaticallyCalculated { get; private set; }
 
-        public SlidingCurve SlidingCurve { get; private set; }
+        public SlidingDualCircle SlidingCurve { get; private set; }
 
         public SlipPlaneUpliftVan SlipPlane { get; private set; }
 
@@ -206,7 +206,7 @@
             ForbiddenZonesXEntryMax = convertedResult.XMaxEntry;
             ForbiddenZonesAutomaticallyCalculated = convertedResult.AreForbiddenZonesAuto;
 
-            SlidingCurve = convertedResult.Curve;
+            SlidingCurve = (SlidingDualCircle) convertedResult.Curve;
             SlipPlane = convertedResult.SlipPlaneUpliftVan;
         }
     }
Index: Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Primitives/Output/MacroStabilityInwardsSlidingCircle.cs
===================================================================
diff -u
--- Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Primitives/Output/MacroStabilityInwardsSlidingCircle.cs	(revision 0)
+++ Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Primitives/Output/MacroStabilityInwardsSlidingCircle.cs	(revision 1f741e6208690a17217cea730557aa10f09bd8ec)
@@ -0,0 +1,66 @@
+// 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 Core.Common.Base.Geometry;
+
+namespace Ringtoets.MacroStabilityInwards.Primitives.Output
+{
+    /// <summary>
+    /// The sliding circle result of a macro stability calculation.
+    /// </summary>
+    public class MacroStabilityInwardsSlidingCircle
+    {
+        /// <summary>
+        /// Creates a new instance of <see cref="MacroStabilityInwardsSlidingCircle"/>.
+        /// </summary>
+        /// <param name="center">The center coordinate of the circle.</param>
+        /// <param name="radius">The radius of the circle.</param>
+        /// <param name="isActive">Indicator whether the circle is active or not.</param>
+        /// <exception cref="ArgumentNullException">Thrown when <paramref name="center"/>
+        /// is <c>null</c>.</exception>
+        public MacroStabilityInwardsSlidingCircle(Point2D center, double radius, bool isActive)
+        {
+            if (center == null)
+            {
+                throw new ArgumentNullException(nameof(center));
+            }
+            Center = center;
+            Radius = radius;
+            IsActive = isActive;
+        }
+
+        /// <summary>
+        /// Gets the center coordinate of the circle.
+        /// </summary>
+        public Point2D Center { get; }
+
+        /// <summary>
+        /// Gets the radius of the circle.
+        /// </summary>
+        public double Radius { get; }
+
+        /// <summary>
+        /// Gets whether the circle is the active circle or not.
+        /// </summary>
+        public bool IsActive { get; }
+    }
+}
\ No newline at end of file
Index: Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Primitives/Output/MacroStabilityInwardsSlidingCurve.cs
===================================================================
diff -u
--- Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Primitives/Output/MacroStabilityInwardsSlidingCurve.cs	(revision 0)
+++ Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Primitives/Output/MacroStabilityInwardsSlidingCurve.cs	(revision 1f741e6208690a17217cea730557aa10f09bd8ec)
@@ -0,0 +1,63 @@
+// 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;
+
+namespace Ringtoets.MacroStabilityInwards.Primitives.Output
+{
+    /// <summary>
+    /// The sliding curve result of a macro stability calculation.
+    /// </summary>
+    public class MacroStabilityInwardsSlidingCurve
+    {
+        /// <summary>
+        /// Creates a new instance of <see cref="MacroStabilityInwardsSlidingCurve"/>.
+        /// </summary>
+        /// <param name="leftCircle">The left circle of the curve.</param>
+        /// <param name="rightCircle">The right circle of the curve.</param>
+        /// <exception cref="ArgumentNullException">Thrown when any parameter
+        /// is <c>null</c>.</exception>
+        public MacroStabilityInwardsSlidingCurve(MacroStabilityInwardsSlidingCircle leftCircle, MacroStabilityInwardsSlidingCircle rightCircle)
+        {
+            if (leftCircle == null)
+            {
+                throw new ArgumentNullException(nameof(leftCircle));
+            }
+            if (rightCircle == null)
+            {
+                throw new ArgumentNullException(nameof(rightCircle));
+            }
+
+            LeftCircle = leftCircle;
+            RightCircle = rightCircle;
+        }
+
+        /// <summary>
+        /// Gets the left circle.
+        /// </summary>
+        public MacroStabilityInwardsSlidingCircle LeftCircle { get; }
+
+        /// <summary>
+        /// Gets the right circle.
+        /// </summary>
+        public MacroStabilityInwardsSlidingCircle RightCircle { get; }
+    }
+}
\ No newline at end of file
Index: Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Primitives/Ringtoets.MacroStabilityInwards.Primitives.csproj
===================================================================
diff -u -r388ce371afb320cab772545f0292d1954fdc38ef -r1f741e6208690a17217cea730557aa10f09bd8ec
--- Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Primitives/Ringtoets.MacroStabilityInwards.Primitives.csproj	(.../Ringtoets.MacroStabilityInwards.Primitives.csproj)	(revision 388ce371afb320cab772545f0292d1954fdc38ef)
+++ Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Primitives/Ringtoets.MacroStabilityInwards.Primitives.csproj	(.../Ringtoets.MacroStabilityInwards.Primitives.csproj)	(revision 1f741e6208690a17217cea730557aa10f09bd8ec)
@@ -54,6 +54,8 @@
     <Compile Include="MacroStabilityInwardsSoilProfile2D.cs" />
     <Compile Include="MacroStabilityInwardsSoilProfile1D.cs" />
     <Compile Include="MacroStabilityInwardsSoilUnderSurfaceLine\MacroStabilityInwardsSoilProfileUnderSurfaceLine.cs" />
+    <Compile Include="Output\MacroStabilityInwardsSlidingCircle.cs" />
+    <Compile Include="Output\MacroStabilityInwardsSlidingCurve.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="Properties\Resources.Designer.cs">
       <DependentUpon>Resources.resx</DependentUpon>
Index: Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.KernelWrapper.Test/MacroStabilityInwardsCalculatorTest.cs
===================================================================
diff -u -r35bb3fb2239c0f3633155ccea59b2b3bad28f52d -r1f741e6208690a17217cea730557aa10f09bd8ec
--- Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.KernelWrapper.Test/MacroStabilityInwardsCalculatorTest.cs	(.../MacroStabilityInwardsCalculatorTest.cs)	(revision 35bb3fb2239c0f3633155ccea59b2b3bad28f52d)
+++ Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.KernelWrapper.Test/MacroStabilityInwardsCalculatorTest.cs	(.../MacroStabilityInwardsCalculatorTest.cs)	(revision 1f741e6208690a17217cea730557aa10f09bd8ec)
@@ -58,7 +58,7 @@
         }
 
         [Test]
-        public void Calculate_Always_ReturnResult()
+        public void Calculate_CompleteValidInput_ReturnsResult()
         {
             // Setup
             var input = new MacroStabilityInwardsCalculatorInput(CreateSimpleConstructionProperties());
@@ -69,6 +69,10 @@
 
             // Assert
             Assert.IsNotNull(actual);
+            Assert.IsFalse(double.IsNaN(actual.FactorOfStability));
+            Assert.IsFalse(double.IsNaN(actual.ZValue));
+            Assert.IsFalse(double.IsNaN(actual.ForbiddenZonesXEntryMax));
+            Assert.IsFalse(double.IsNaN(actual.ForbiddenZonesXEntryMin));
 
             Assert.IsTrue(testMacroStabilityInwardsSubCalculatorFactory.LastCreatedUpliftVanCalculator.Calculated);
         }
Index: Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.KernelWrapper.TestUtil/SubCalculator/UpliftVanCalculatorStub.cs
===================================================================
diff -u -r0e9146a3375e69a172409554b934db2cc14b3f84 -r1f741e6208690a17217cea730557aa10f09bd8ec
--- Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.KernelWrapper.TestUtil/SubCalculator/UpliftVanCalculatorStub.cs	(.../UpliftVanCalculatorStub.cs)	(revision 0e9146a3375e69a172409554b934db2cc14b3f84)
+++ Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.KernelWrapper.TestUtil/SubCalculator/UpliftVanCalculatorStub.cs	(.../UpliftVanCalculatorStub.cs)	(revision 1f741e6208690a17217cea730557aa10f09bd8ec)
@@ -69,7 +69,7 @@
 
         public bool ForbiddenZonesAutomaticallyCalculated { get; set; }
 
-        public SlidingCurve SlidingCurve { get; set; }
+        public SlidingDualCircle SlidingCurve { get; set; }
 
         public SlipPlaneUpliftVan SlipPlane { get; set; }
 
Index: Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Primitives.Test/Output/MacroStabilityInwardsSlidingCircleTest.cs
===================================================================
diff -u
--- Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Primitives.Test/Output/MacroStabilityInwardsSlidingCircleTest.cs	(revision 0)
+++ Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Primitives.Test/Output/MacroStabilityInwardsSlidingCircleTest.cs	(revision 1f741e6208690a17217cea730557aa10f09bd8ec)
@@ -0,0 +1,62 @@
+// 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 Core.Common.Base.Geometry;
+using Core.Common.TestUtil;
+using NUnit.Framework;
+using Ringtoets.MacroStabilityInwards.Primitives.Output;
+
+namespace Ringtoets.MacroStabilityInwards.Primitives.Test.Output
+{
+    [TestFixture]
+    public class MacroStabilityInwardsSlidingCircleTest
+    {
+        [Test]
+        public void Constructor_CenterNull_ThrowsArgumentNullException()
+        {
+            // Call
+            TestDelegate call = () => new MacroStabilityInwardsSlidingCircle(null, 0.1, true);
+
+            // Assert
+            var exception = Assert.Throws<ArgumentNullException>(call);
+            Assert.AreEqual("center", exception.ParamName);
+        }
+
+        [Test]
+        public void Constructor_ExpectedValues()
+        {
+            // Setup
+            var random = new Random(11);
+            var center = new Point2D(random.NextDouble(), random.NextDouble());
+            double radius = random.NextDouble();
+            bool isActive = random.NextBoolean();
+
+            // Call
+            var circle = new MacroStabilityInwardsSlidingCircle(center, radius, isActive);
+
+            // Assert
+            Assert.AreEqual(center, circle.Center);
+            Assert.AreEqual(radius, circle.Radius);
+            Assert.AreEqual(isActive, circle.IsActive);
+        }
+    }
+}
\ No newline at end of file
Index: Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Primitives.Test/Output/MacroStabilityInwardsSlidingCurveTest.cs
===================================================================
diff -u
--- Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Primitives.Test/Output/MacroStabilityInwardsSlidingCurveTest.cs	(revision 0)
+++ Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Primitives.Test/Output/MacroStabilityInwardsSlidingCurveTest.cs	(revision 1f741e6208690a17217cea730557aa10f09bd8ec)
@@ -0,0 +1,75 @@
+// 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 Core.Common.Base.Geometry;
+using NUnit.Framework;
+using Ringtoets.MacroStabilityInwards.Primitives.Output;
+
+namespace Ringtoets.MacroStabilityInwards.Primitives.Test.Output
+{
+    [TestFixture]
+    public class MacroStabilityInwardsSlidingCurveTest
+    {
+        [Test]
+        public void Constructor_LeftCircleNull_ThrowsArgumentNullException()
+        {
+            // Setup
+            var rightCircle = new MacroStabilityInwardsSlidingCircle(new Point2D(0, 0), 3, false);
+
+            // Call
+            TestDelegate call = () => new MacroStabilityInwardsSlidingCurve(null, rightCircle);
+
+            // Assert
+            var exception = Assert.Throws<ArgumentNullException>(call);
+            Assert.AreEqual("leftCircle", exception.ParamName);
+        }
+
+        [Test]
+        public void Constructor_RightCircleNull_ThrowsArgumentNullException()
+        {
+            // Setup
+            var leftCircle = new MacroStabilityInwardsSlidingCircle(new Point2D(0, 0), 3, true);
+
+            // Call
+            TestDelegate call = () => new MacroStabilityInwardsSlidingCurve(leftCircle, null);
+
+            // Assert
+            var exception = Assert.Throws<ArgumentNullException>(call);
+            Assert.AreEqual("rightCircle", exception.ParamName);
+        }
+
+        [Test]
+        public void Constructor_ExpectedValues()
+        {
+            // Setup
+            var leftCircle = new MacroStabilityInwardsSlidingCircle(new Point2D(0, 0), 5, true);
+            var rightCircle = new MacroStabilityInwardsSlidingCircle(new Point2D(10, 10), 2, false);
+
+            // Call
+            var curve = new MacroStabilityInwardsSlidingCurve(leftCircle, rightCircle);
+
+            // Assert
+            Assert.AreSame(leftCircle, curve.LeftCircle);
+            Assert.AreSame(rightCircle, curve.RightCircle);
+        }
+    }
+}
\ No newline at end of file
Index: Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Primitives.Test/Ringtoets.MacroStabilityInwards.Primitives.Test.csproj
===================================================================
diff -u -r388ce371afb320cab772545f0292d1954fdc38ef -r1f741e6208690a17217cea730557aa10f09bd8ec
--- Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Primitives.Test/Ringtoets.MacroStabilityInwards.Primitives.Test.csproj	(.../Ringtoets.MacroStabilityInwards.Primitives.Test.csproj)	(revision 388ce371afb320cab772545f0292d1954fdc38ef)
+++ Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Primitives.Test/Ringtoets.MacroStabilityInwards.Primitives.Test.csproj	(.../Ringtoets.MacroStabilityInwards.Primitives.Test.csproj)	(revision 1f741e6208690a17217cea730557aa10f09bd8ec)
@@ -64,6 +64,8 @@
     <Compile Include="MacroStabilityInwardsSoilProfile2DTest.cs" />
     <Compile Include="MacroStabilityInwardsSoilProfile1DTest.cs" />
     <Compile Include="MacroStabilityInwardsSoilUnderSurfaceLine\MacroStabilityInwardsSoilProfileUnderSurfaceLineTest.cs" />
+    <Compile Include="Output\MacroStabilityInwardsSlidingCircleTest.cs" />
+    <Compile Include="Output\MacroStabilityInwardsSlidingCurveTest.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="RingTest.cs" />
     <Compile Include="MacroStabilityInwardsSurfaceLineTest.cs" />