Index: Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.IO/Model/SerializableAssembly.cs
===================================================================
diff -u -r7deb19aedd02c79cf6ce19e629fec1a6c0ee4e1e -rb50aa5c330d5c514ef0727cb9b732094c228eb46
--- Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.IO/Model/SerializableAssembly.cs	(.../SerializableAssembly.cs)	(revision 7deb19aedd02c79cf6ce19e629fec1a6c0ee4e1e)
+++ Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.IO/Model/SerializableAssembly.cs	(.../SerializableAssembly.cs)	(revision b50aa5c330d5c514ef0727cb9b732094c228eb46)
@@ -20,7 +20,6 @@
 // All rights reserved.
 
 using System;
-using System.Collections.Generic;
 using System.Xml.Serialization;
 using Core.Common.Base.Geometry;
 using Ringtoets.AssemblyTool.IO.Model.Gml;
@@ -48,7 +47,7 @@
         /// <param name="featureMembers">The collection of <see cref="SerializableFeatureMember"/> that
         /// belong to the assembly.</param>
         /// <exception cref="ArgumentNullException">Thrown when any parameter is <c>null</c>.</exception>
-        public SerializableAssembly(string id, Point2D lowerCorner, Point2D upperCorner, List<SerializableFeatureMember> featureMembers)
+        public SerializableAssembly(string id, Point2D lowerCorner, Point2D upperCorner, SerializableFeatureMember[] featureMembers)
         {
             if (id == null)
             {
@@ -96,6 +95,6 @@
         [XmlArrayItem(typeof(SerializableTotalAssemblyResult))]
         [XmlArrayItem(typeof(SerializableFailureMechanism))]
         [XmlArrayItem(typeof(SerializableFailureMechanismSectionAssembly))]
-        public List<SerializableFeatureMember> FeatureMembers { get; set; }
+        public SerializableFeatureMember[] FeatureMembers { get; set; }
     }
 }
\ No newline at end of file
Index: Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.IO/Model/SerializableFailureMechanismSectionAssembly.cs
===================================================================
diff -u -r7deb19aedd02c79cf6ce19e629fec1a6c0ee4e1e -rb50aa5c330d5c514ef0727cb9b732094c228eb46
--- Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.IO/Model/SerializableFailureMechanismSectionAssembly.cs	(.../SerializableFailureMechanismSectionAssembly.cs)	(revision 7deb19aedd02c79cf6ce19e629fec1a6c0ee4e1e)
+++ Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.IO/Model/SerializableFailureMechanismSectionAssembly.cs	(.../SerializableFailureMechanismSectionAssembly.cs)	(revision b50aa5c330d5c514ef0727cb9b732094c228eb46)
@@ -20,7 +20,6 @@
 // All rights reserved.
 
 using System;
-using System.Collections.Generic;
 using System.Xml.Serialization;
 using Ringtoets.AssemblyTool.IO.Model.DataTypes;
 
@@ -47,7 +46,7 @@
         /// <exception cref="ArgumentNullException">Thrown when any parameter is <c>null</c>.</exception>
         public SerializableFailureMechanismSectionAssembly(string id,
                                                            SerializableFailureMechanism failureMechanism,
-                                                           List<SerializableFailureMechanismSectionAssemblyResult> sectionResults,
+                                                           SerializableFailureMechanismSectionAssemblyResult[] sectionResults,
                                                            SerializableFailureMechanismSectionAssemblyResult combinedSectionResult) : this()
         {
             if (id == null)
@@ -95,10 +94,9 @@
         public SerializableFailureMechanismSectionAssemblyResult CombinedSectionResult { get; set; }
 
         /// <summary>
-        /// Gets or sets the list of results for this section.
+        /// Gets or sets the array of results for this section.
         /// </summary>
         [XmlElement(AssemblyXmlIdentifiers.SectionResults)]
-        public List<SerializableFailureMechanismSectionAssemblyResult> SectionResults { get; set; }
-
+        public SerializableFailureMechanismSectionAssemblyResult[] SectionResults { get; set; }
     }
 }
\ No newline at end of file
Index: Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.Test/Model/SerializableAssemblyTest.cs
===================================================================
diff -u -r7deb19aedd02c79cf6ce19e629fec1a6c0ee4e1e -rb50aa5c330d5c514ef0727cb9b732094c228eb46
--- Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.Test/Model/SerializableAssemblyTest.cs	(.../SerializableAssemblyTest.cs)	(revision 7deb19aedd02c79cf6ce19e629fec1a6c0ee4e1e)
+++ Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.Test/Model/SerializableAssemblyTest.cs	(.../SerializableAssemblyTest.cs)	(revision b50aa5c330d5c514ef0727cb9b732094c228eb46)
@@ -56,7 +56,7 @@
             Assert.AreEqual("Assemblage", xmlRootAttribute.ElementName);
             Assert.AreEqual("http://localhost/standaarden/assemblage", xmlRootAttribute.Namespace);
 
-            var gmlNamespace = "http://www.opengis.net/gml/3.2";
+            const string gmlNamespace = "http://www.opengis.net/gml/3.2";
             SerializableAttributeTestHelper.AssertXmlAttributeAttribute<SerializableAssembly>(
                 nameof(SerializableAssembly.Id), "id", gmlNamespace);
             SerializableAttributeTestHelper.AssertXmlElementAttribute<SerializableAssembly>(
@@ -84,7 +84,7 @@
             TestDelegate call = () => new SerializableAssembly(null,
                                                                new Point2D(random.NextDouble(), random.NextDouble()),
                                                                new Point2D(random.NextDouble(), random.NextDouble()),
-                                                               new List<SerializableFeatureMember>());
+                                                               new SerializableFeatureMember[0]);
 
             // Assert
             var exception = Assert.Throws<ArgumentNullException>(call);
@@ -101,7 +101,7 @@
             TestDelegate call = () => new SerializableAssembly(string.Empty,
                                                                null,
                                                                new Point2D(random.NextDouble(), random.NextDouble()),
-                                                               new List<SerializableFeatureMember>());
+                                                               new SerializableFeatureMember[0]);
 
             // Assert
             var exception = Assert.Throws<ArgumentNullException>(call);
@@ -118,7 +118,7 @@
             TestDelegate call = () => new SerializableAssembly(string.Empty,
                                                                new Point2D(random.NextDouble(), random.NextDouble()),
                                                                null,
-                                                               new List<SerializableFeatureMember>());
+                                                               new SerializableFeatureMember[0]);
             // Assert
             var exception = Assert.Throws<ArgumentNullException>(call);
             Assert.AreEqual("upperCorner", exception.ParamName);
@@ -155,7 +155,7 @@
             var assembly = new SerializableAssembly(id,
                                                     lowerCorner,
                                                     upperCorner,
-                                                    new List<SerializableFeatureMember>
+                                                    new[]
                                                     {
                                                         featureMember
                                                     });
@@ -206,22 +206,22 @@
                 new SerializableFailureMechanismAssemblyResult(SerializableAssemblyMethod.WBI3C1, SerializableFailureMechanismCategoryGroup.NotApplicable, 0.000124));
 
             var failureMechanism1 = new SerializableFailureMechanism("fm1",
-                totalAssemblyResult,
-                SerializableFailureMechanismType.GABI,
-                SerializableAssemblyGroup.Group4,
-                new SerializableFailureMechanismAssemblyResult(SerializableAssemblyMethod.WBI1A1, SerializableFailureMechanismCategoryGroup.IIt));
+                                                                     totalAssemblyResult,
+                                                                     SerializableFailureMechanismType.GABI,
+                                                                     SerializableAssemblyGroup.Group4,
+                                                                     new SerializableFailureMechanismAssemblyResult(SerializableAssemblyMethod.WBI1A1, SerializableFailureMechanismCategoryGroup.IIt));
 
             var result1 = new SerializableFailureMechanismSectionAssembly("sr1",
                                                                           failureMechanism1,
-                new List<SerializableFailureMechanismSectionAssemblyResult>
-                {
-                    new SerializableFailureMechanismSectionAssemblyResult(SerializableAssemblyMethod.WBI0E1, SerializableAssessmentLevel.SimpleAssessment, SerializableFailureMechanismSectionCategoryGroup.IIv, 0.5),
-                    new SerializableFailureMechanismSectionAssemblyResult(SerializableAssemblyMethod.WBI0T5, SerializableAssessmentLevel.TailorMadeAssessment, SerializableFailureMechanismSectionCategoryGroup.IIIv)
-                },
-                new SerializableFailureMechanismSectionAssemblyResult(SerializableAssemblyMethod.WBI0A1, SerializableAssessmentLevel.CombinedAssessment, SerializableFailureMechanismSectionCategoryGroup.IIIv));
+                                                                          new[]
+                                                                          {
+                                                                              new SerializableFailureMechanismSectionAssemblyResult(SerializableAssemblyMethod.WBI0E1, SerializableAssessmentLevel.SimpleAssessment, SerializableFailureMechanismSectionCategoryGroup.IIv, 0.5),
+                                                                              new SerializableFailureMechanismSectionAssemblyResult(SerializableAssemblyMethod.WBI0T5, SerializableAssessmentLevel.TailorMadeAssessment, SerializableFailureMechanismSectionCategoryGroup.IIIv)
+                                                                          },
+                                                                          new SerializableFailureMechanismSectionAssemblyResult(SerializableAssemblyMethod.WBI0A1, SerializableAssessmentLevel.CombinedAssessment, SerializableFailureMechanismSectionCategoryGroup.IIIv));
 
             var assembly = new SerializableAssembly("assembly_1", new Point2D(12.0, 34.0), new Point2D(56.053, 78.0002345),
-                                                    new List<SerializableFeatureMember>
+                                                    new SerializableFeatureMember[]
                                                     {
                                                         assessmentSection,
                                                         assessmentProcess,
Index: Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.Test/Model/SerializableFailureMechanismSectionAssemblyTest.cs
===================================================================
diff -u -r7deb19aedd02c79cf6ce19e629fec1a6c0ee4e1e -rb50aa5c330d5c514ef0727cb9b732094c228eb46
--- Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.Test/Model/SerializableFailureMechanismSectionAssemblyTest.cs	(.../SerializableFailureMechanismSectionAssemblyTest.cs)	(revision 7deb19aedd02c79cf6ce19e629fec1a6c0ee4e1e)
+++ Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.Test/Model/SerializableFailureMechanismSectionAssemblyTest.cs	(.../SerializableFailureMechanismSectionAssemblyTest.cs)	(revision b50aa5c330d5c514ef0727cb9b732094c228eb46)
@@ -20,7 +20,6 @@
 // All rights reserved.
 
 using System;
-using System.Collections.Generic;
 using NUnit.Framework;
 using Ringtoets.AssemblyTool.IO.Model;
 using Ringtoets.AssemblyTool.IO.Model.DataTypes;
@@ -61,7 +60,7 @@
             // Call
             TestDelegate call = () => new SerializableFailureMechanismSectionAssembly(null,
                                                                                       new SerializableFailureMechanism(),
-                                                                                      new List<SerializableFailureMechanismSectionAssemblyResult>(),
+                                                                                      new SerializableFailureMechanismSectionAssemblyResult[0],
                                                                                       new SerializableFailureMechanismSectionAssemblyResult());
 
             // Assert
@@ -75,7 +74,7 @@
             // Call
             TestDelegate call = () => new SerializableFailureMechanismSectionAssembly("id",
                                                                                       null,
-                                                                                      new List<SerializableFailureMechanismSectionAssemblyResult>(),
+                                                                                      new SerializableFailureMechanismSectionAssemblyResult[0],
                                                                                       new SerializableFailureMechanismSectionAssemblyResult());
 
             // Assert
@@ -103,7 +102,7 @@
             // Call
             TestDelegate call = () => new SerializableFailureMechanismSectionAssembly("id",
                                                                                       new SerializableFailureMechanism(),
-                                                                                      new List<SerializableFailureMechanismSectionAssemblyResult>(),
+                                                                                      new SerializableFailureMechanismSectionAssemblyResult[0],
                                                                                       null);
 
             // Assert
@@ -118,7 +117,7 @@
             const string id = "id";
 
             var failureMechanism = new SerializableFailureMechanism();
-            var sectionResults = new List<SerializableFailureMechanismSectionAssemblyResult>();
+            var sectionResults = new SerializableFailureMechanismSectionAssemblyResult[0];
             var combinedSectionResult = new SerializableFailureMechanismSectionAssemblyResult();
 
             // Call