Index: Ringtoets/Common/src/Ringtoets.Common.Service/IllustrationPoints/WindDirectionClosingSituationIllustrationPointConverter.cs
===================================================================
diff -u -r0fd23ff8e68b5f0d18d344d104bc68216cb49b51 -r5f1c70d7eea83fca2ef6305a87a8098820ded1d9
--- Ringtoets/Common/src/Ringtoets.Common.Service/IllustrationPoints/WindDirectionClosingSituationIllustrationPointConverter.cs	(.../WindDirectionClosingSituationIllustrationPointConverter.cs)	(revision 0fd23ff8e68b5f0d18d344d104bc68216cb49b51)
+++ Ringtoets/Common/src/Ringtoets.Common.Service/IllustrationPoints/WindDirectionClosingSituationIllustrationPointConverter.cs	(.../WindDirectionClosingSituationIllustrationPointConverter.cs)	(revision 5f1c70d7eea83fca2ef6305a87a8098820ded1d9)
@@ -42,17 +42,8 @@
         /// to base the <see cref="WindDirectionClosingSituationIllustrationPoint"/> on.</param>
         /// <param name="hydraSubMechanismIllustrationPoint">The <see cref="SubMechanismIllustrationPoint"/>
         /// to base the <see cref="WindDirectionClosingSituationIllustrationPoint"/> on.</param>
-        /// <returns></returns>
-        /// <exception cref="ArgumentNullException">Thrown when any of:
-        /// <list type="bullet">
-        /// <item><paramref name="hydraWindDirectionClosingSituation"/>,</item>
-        /// <item><paramref name="hydraSubMechanismIllustrationPoint"/>,</item>
-        /// <item><see cref="SubMechanismIllustrationPoint.Name"/>,</item>
-        /// <item><see cref="HydraRing.Calculation.Data.Output.IllustrationPoints.WindDirection.Name"/></item>
-        /// </list> are <c>null</c>.</exception>
-        /// <exception cref="ArgumentOutOfRangeException">Thrown when 
-        /// <see cref="HydraRing.Calculation.Data.Output.IllustrationPoints.WindDirection.Angle"/>
-        /// is not in the interval of [0, 360].</exception>
+        /// <returns>A <see cref="WindDirectionClosingSituationIllustrationPoint"/>.</returns>
+        /// <exception cref="ArgumentNullException">Thrown when any parameter is <c>null</c>.</exception>
         public static WindDirectionClosingSituationIllustrationPoint CreateWindDirectionClosingScenarioIllustrationPoint(
             WindDirectionClosingSituation hydraWindDirectionClosingSituation,
             SubMechanismIllustrationPoint hydraSubMechanismIllustrationPoint)
Index: Ringtoets/Common/test/Ringtoets.Common.Service.Test/IllustrationPoints/GeneralResultConverterTest.cs
===================================================================
diff -u -r342ecb50ef0e54c04002a2643689c6d0108518c7 -r5f1c70d7eea83fca2ef6305a87a8098820ded1d9
--- Ringtoets/Common/test/Ringtoets.Common.Service.Test/IllustrationPoints/GeneralResultConverterTest.cs	(.../GeneralResultConverterTest.cs)	(revision 342ecb50ef0e54c04002a2643689c6d0108518c7)
+++ Ringtoets/Common/test/Ringtoets.Common.Service.Test/IllustrationPoints/GeneralResultConverterTest.cs	(.../GeneralResultConverterTest.cs)	(revision 5f1c70d7eea83fca2ef6305a87a8098820ded1d9)
@@ -88,11 +88,8 @@
             var hydraWindDirectionClosingSituation =
                 new WindDirectionClosingSituation(hydraWindDirection, closingSituation);
 
-            var hydraIllustrationPoint = new HydraSubMechanismIllustrationPoint
-            {
-                Beta = random.NextDouble(),
-                Name = " IllustrationPoint"
-            };
+            double beta = random.NextDouble();
+            var hydraIllustrationPoint = new HydraSubMechanismIllustrationPoint("Illustration Point", beta);
             var hydraIllustrationTreeNode = new IllustrationPointTreeNode(hydraIllustrationPoint);
 
             double governingWindDirectionAngle = random.NextDouble();
Index: Ringtoets/Common/test/Ringtoets.Common.Service.Test/IllustrationPoints/IllustrationPointConverterTest.cs
===================================================================
diff -u -r0fd23ff8e68b5f0d18d344d104bc68216cb49b51 -r5f1c70d7eea83fca2ef6305a87a8098820ded1d9
--- Ringtoets/Common/test/Ringtoets.Common.Service.Test/IllustrationPoints/IllustrationPointConverterTest.cs	(.../IllustrationPointConverterTest.cs)	(revision 0fd23ff8e68b5f0d18d344d104bc68216cb49b51)
+++ Ringtoets/Common/test/Ringtoets.Common.Service.Test/IllustrationPoints/IllustrationPointConverterTest.cs	(.../IllustrationPointConverterTest.cs)	(revision 5f1c70d7eea83fca2ef6305a87a8098820ded1d9)
@@ -64,10 +64,10 @@
                 Name = "HydraRealizedStochast",
                 Realization = random.NextDouble()
             };
-            var subMechanismIllustrationPoint = new SubMechanismIllustrationPoint
+
+            double beta = random.NextDouble();
+            var subMechanismIllustrationPoint = new SubMechanismIllustrationPoint("name", beta)
             {
-                Beta = random.NextDouble(),
-                Name = "name",
                 Results =
                 {
                     hydraIllustrationPointResult
Index: Ringtoets/Common/test/Ringtoets.Common.Service.Test/IllustrationPoints/WindDirectionClosingSituationIllustrationPointConverterTest.cs
===================================================================
diff -u -r342ecb50ef0e54c04002a2643689c6d0108518c7 -r5f1c70d7eea83fca2ef6305a87a8098820ded1d9
--- Ringtoets/Common/test/Ringtoets.Common.Service.Test/IllustrationPoints/WindDirectionClosingSituationIllustrationPointConverterTest.cs	(.../WindDirectionClosingSituationIllustrationPointConverterTest.cs)	(revision 342ecb50ef0e54c04002a2643689c6d0108518c7)
+++ Ringtoets/Common/test/Ringtoets.Common.Service.Test/IllustrationPoints/WindDirectionClosingSituationIllustrationPointConverterTest.cs	(.../WindDirectionClosingSituationIllustrationPointConverterTest.cs)	(revision 5f1c70d7eea83fca2ef6305a87a8098820ded1d9)
@@ -44,7 +44,7 @@
             TestDelegate call = () =>
                 WindDirectionClosingSituationIllustrationPointConverter.CreateWindDirectionClosingScenarioIllustrationPoint(
                     null,
-                    new HydraSubMechanismIllustrationPoint());
+                    new HydraSubMechanismIllustrationPoint("name", 123));
 
             // Assert
             string paramName = Assert.Throws<ArgumentNullException>(call).ParamName;
@@ -92,10 +92,10 @@
                 Name = "HydraRealizedStochast",
                 Realization = random.NextDouble()
             };
-            var subMechanismIllustrationPoint = new HydraSubMechanismIllustrationPoint
+
+            double beta = random.NextDouble();
+            var subMechanismIllustrationPoint = new HydraSubMechanismIllustrationPoint("name", beta)
             {
-                Beta = random.NextDouble(),
-                Name = "name",
                 Results =
                 {
                     hydraIllustrationPointResult
Index: Ringtoets/HydraRing/src/Ringtoets.HydraRing.Calculation/Data/Output/IllustrationPoints/SubmechanismIllustrationPoint.cs
===================================================================
diff -u -r0fd23ff8e68b5f0d18d344d104bc68216cb49b51 -r5f1c70d7eea83fca2ef6305a87a8098820ded1d9
--- Ringtoets/HydraRing/src/Ringtoets.HydraRing.Calculation/Data/Output/IllustrationPoints/SubmechanismIllustrationPoint.cs	(.../SubmechanismIllustrationPoint.cs)	(revision 0fd23ff8e68b5f0d18d344d104bc68216cb49b51)
+++ Ringtoets/HydraRing/src/Ringtoets.HydraRing.Calculation/Data/Output/IllustrationPoints/SubmechanismIllustrationPoint.cs	(.../SubmechanismIllustrationPoint.cs)	(revision 5f1c70d7eea83fca2ef6305a87a8098820ded1d9)
@@ -19,6 +19,7 @@
 // Stichting Deltares and remain full property of Stichting Deltares at all times.
 // All rights reserved.
 
+using System;
 using System.Collections.Generic;
 
 namespace Ringtoets.HydraRing.Calculation.Data.Output.IllustrationPoints
@@ -29,23 +30,44 @@
     public class SubMechanismIllustrationPoint : IIllustrationPoint
     {
         /// <summary>
+        /// Creates a new instance of <see cref="SubMechanismIllustrationPoint"/>.
+        /// </summary>
+        /// <param name="name">The name of the illustration point.</param>
+        /// <param name="beta">The beta value of the illustration point</param>
+        /// <exception cref="ArgumentNullException">Thrown when <paramref name="name"/>
+        /// is <c>null</c>.</exception>
+        public SubMechanismIllustrationPoint(string name, double beta)
+        {
+            if (name == null)
+            {
+                throw new ArgumentNullException(nameof(name));
+            }
+
+            Name = name;
+            Beta = beta;
+            Stochasts = new List<RealizedStochast>();
+            Results = new List<IllustrationPointResult>();
+        }
+
+
+        /// <summary>
         /// Gets or sets the name.
         /// </summary>
         public string Name { get; set; }
 
         /// <summary>
         /// Gets the stochasts that were realized.
         /// </summary>
-        public ICollection<RealizedStochast> Stochasts { get; } = new List<RealizedStochast>();
+        public ICollection<RealizedStochast> Stochasts { get; }
 
         /// <summary>
         /// Gets the beta values that were realized.
         /// </summary>
-        public double Beta { get; set; } = double.NaN;
+        public double Beta { get; set; }
 
         /// <summary>
         /// Gets the output variables.
         /// </summary>
-        public ICollection<IllustrationPointResult> Results { get; } = new List<IllustrationPointResult>();
+        public ICollection<IllustrationPointResult> Results { get; }
     }
 }
\ No newline at end of file
Index: Ringtoets/HydraRing/src/Ringtoets.HydraRing.Calculation/Parsers/IllustrationPoints/IllustrationPointsParser.cs
===================================================================
diff -u -r342ecb50ef0e54c04002a2643689c6d0108518c7 -r5f1c70d7eea83fca2ef6305a87a8098820ded1d9
--- Ringtoets/HydraRing/src/Ringtoets.HydraRing.Calculation/Parsers/IllustrationPoints/IllustrationPointsParser.cs	(.../IllustrationPointsParser.cs)	(revision 342ecb50ef0e54c04002a2643689c6d0108518c7)
+++ Ringtoets/HydraRing/src/Ringtoets.HydraRing.Calculation/Parsers/IllustrationPoints/IllustrationPointsParser.cs	(.../IllustrationPointsParser.cs)	(revision 5f1c70d7eea83fca2ef6305a87a8098820ded1d9)
@@ -125,11 +125,11 @@
             var rootIllustrationPoints = new Dictionary<WindDirectionClosingSituation, IllustrationPointTreeNode>();
             foreach (Tuple<int, WindDirection, int, string> windDirectionClosingSituation in GetAllWindDirectionClosingSituationCombinations())
             {
-                var illustrationPoint = new SubMechanismIllustrationPoint
-                {
-                    Name = subMechanisms.First().Value,
-                    Beta = subMechanismBetaValues.First().Value
-                };
+                string submechanismIllustrationPointName = subMechanisms.First().Value;
+                double subMechanismIllustrationPointBeta = subMechanismBetaValues.First().Value;
+                var illustrationPoint = new SubMechanismIllustrationPoint(submechanismIllustrationPointName,
+                                                                          subMechanismIllustrationPointBeta);
+
                 AddRange(illustrationPoint.Results, subMechanismResults.First().Value);
                 AddRange(illustrationPoint.Stochasts, subMechanismStochasts.First().Value);
 
@@ -335,11 +335,12 @@
         private IllustrationPointTreeNode BuildSubMechanism(Tuple<int, WindDirection, int, string> windDirectionClosingSituation, int subMechanismId)
         {
             var dataKey = new ThreeKeyIndex(windDirectionClosingSituation.Item1, windDirectionClosingSituation.Item3, subMechanismId);
-            var illustrationPoint = new SubMechanismIllustrationPoint
-            {
-                Name = subMechanisms[subMechanismId],
-                Beta = subMechanismBetaValues[dataKey]
-            };
+
+            string submechanismIllustrationPointName = subMechanisms[subMechanismId];
+            double subMechanismIllustrationPointBeta = subMechanismBetaValues[dataKey];
+            var illustrationPoint = new SubMechanismIllustrationPoint(submechanismIllustrationPointName,
+                                                                      subMechanismIllustrationPointBeta);
+
             if (subMechanismStochasts.ContainsKey(dataKey))
             {
                 AddRange(illustrationPoint.Stochasts, subMechanismStochasts[dataKey]);
Index: Ringtoets/HydraRing/test/Ringtoets.HydraRing.Calculation.Test/Data/Output/IllustrationPoints/SubMechanismIllustrationPointTest.cs
===================================================================
diff -u -r0fd23ff8e68b5f0d18d344d104bc68216cb49b51 -r5f1c70d7eea83fca2ef6305a87a8098820ded1d9
--- Ringtoets/HydraRing/test/Ringtoets.HydraRing.Calculation.Test/Data/Output/IllustrationPoints/SubMechanismIllustrationPointTest.cs	(.../SubMechanismIllustrationPointTest.cs)	(revision 0fd23ff8e68b5f0d18d344d104bc68216cb49b51)
+++ Ringtoets/HydraRing/test/Ringtoets.HydraRing.Calculation.Test/Data/Output/IllustrationPoints/SubMechanismIllustrationPointTest.cs	(.../SubMechanismIllustrationPointTest.cs)	(revision 5f1c70d7eea83fca2ef6305a87a8098820ded1d9)
@@ -19,6 +19,7 @@
 // Stichting Deltares and remain full property of Stichting Deltares at all times.
 // All rights reserved.
 
+using System;
 using NUnit.Framework;
 using Ringtoets.HydraRing.Calculation.Data.Output.IllustrationPoints;
 
@@ -28,16 +29,33 @@
     public class SubMechanismIllustrationPointTest
     {
         [Test]
+        public void Constructor_NameNull_ThrowsArgumentNullException()
+        {
+            // Call
+            TestDelegate call = () => new SubMechanismIllustrationPoint(null, 123);
+
+            // Assert
+            var exception = Assert.Throws<ArgumentNullException>(call);
+            Assert.AreEqual("name", exception.ParamName);
+        }
+
+        [Test]
         public void Constructor_WithParameter_ReturnsNewInstance()
         {
+            // Setup
+            const string name = "Name";
+
+            var random = new Random(21);
+            double beta = random.NextDouble();
+
             // Call
-            var illustrationPoint = new SubMechanismIllustrationPoint();
+            var illustrationPoint = new SubMechanismIllustrationPoint(name, beta);
 
             // Assert
             Assert.IsInstanceOf<IIllustrationPoint>(illustrationPoint);
             Assert.IsEmpty(illustrationPoint.Stochasts);
             Assert.IsEmpty(illustrationPoint.Results);
-            Assert.IsNaN(illustrationPoint.Beta);
+            Assert.AreEqual(beta, illustrationPoint.Beta);
         }
     }
 }
\ No newline at end of file