Index: Ringtoets/Common/src/Ringtoets.Common.Data/Calculation/CalculationGroup.cs
===================================================================
diff -u -r17b11c850b35c3ea99150ba25098b5b769b58f4f -rfb83f35cff901948b621ab14c2064590b33f17a0
--- Ringtoets/Common/src/Ringtoets.Common.Data/Calculation/CalculationGroup.cs	(.../CalculationGroup.cs)	(revision 17b11c850b35c3ea99150ba25098b5b769b58f4f)
+++ Ringtoets/Common/src/Ringtoets.Common.Data/Calculation/CalculationGroup.cs	(.../CalculationGroup.cs)	(revision fb83f35cff901948b621ab14c2064590b33f17a0)
@@ -21,6 +21,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using Core.Common.Base;
 using Ringtoets.Common.Data.Properties;
 
@@ -59,7 +60,7 @@
         /// <summary>
         /// Gets the children that define this group.
         /// </summary>
-        public IList<ICalculationBase> Children { get; }
+        public IList<ICalculationBase> Children { get; private set; }
 
         public string Name
         {
@@ -79,7 +80,11 @@
 
         public object Clone()
         {
-            throw new NotImplementedException();
+            var clone = (CalculationGroup) MemberwiseClone();
+
+            clone.Children = Children.Select(c => (ICalculationBase) c.Clone()).ToArray();
+
+            return clone;
         }
     }
 }
\ No newline at end of file
Index: Ringtoets/Common/test/Ringtoets.Common.Data.Test/Calculation/CalculationGroupTest.cs
===================================================================
diff -u -r3178e116f5e59e03078d465efeb303c5e232c7bf -rfb83f35cff901948b621ab14c2064590b33f17a0
--- Ringtoets/Common/test/Ringtoets.Common.Data.Test/Calculation/CalculationGroupTest.cs	(.../CalculationGroupTest.cs)	(revision 3178e116f5e59e03078d465efeb303c5e232c7bf)
+++ Ringtoets/Common/test/Ringtoets.Common.Data.Test/Calculation/CalculationGroupTest.cs	(.../CalculationGroupTest.cs)	(revision fb83f35cff901948b621ab14c2064590b33f17a0)
@@ -21,9 +21,12 @@
 
 using System;
 using Core.Common.Base;
+using Core.Common.Data.TestUtil;
+using Core.Common.TestUtil;
 using NUnit.Framework;
 using Rhino.Mocks;
 using Ringtoets.Common.Data.Calculation;
+using Ringtoets.Common.Data.TestUtil;
 
 namespace Ringtoets.Common.Data.Test.Calculation
 {
@@ -222,5 +225,42 @@
                                            }, group.Children,
                                            "Already existing items should have remained in collection and new item should be added.");
         }
+
+        [Test]
+        public void Clone_Always_ReturnNewInstanceWithCopiedValues()
+        {
+            // Setup
+            var random = new Random(21);
+            var original = new CalculationGroup("Random group name", random.NextBoolean())
+            {
+                Children =
+                {
+                    new TestCalculationBase
+                    {
+                        Name = "Random item name 1"
+                    },
+                    new TestCalculationBase
+                    {
+                        Name = "Random item name 2"
+                    }
+                }
+            };
+
+            // Call
+            object clone = original.Clone();
+
+            // Assert
+            CoreCloneAssert.AreObjectClones(original, clone, CommonCloneAssert.AreEqual);
+        }
+
+        private class TestCalculationBase : Observable, ICalculationBase
+        {
+            public string Name { get; set; }
+
+            public object Clone()
+            {
+                return MemberwiseClone();
+            }
+        }
     }
 }
\ No newline at end of file
Index: Ringtoets/Common/test/Ringtoets.Common.Data.TestUtil/CommonCloneAssert.cs
===================================================================
diff -u -r268c1647f0094f6c43aeceaa5793437562cffe5a -rfb83f35cff901948b621ab14c2064590b33f17a0
--- Ringtoets/Common/test/Ringtoets.Common.Data.TestUtil/CommonCloneAssert.cs	(.../CommonCloneAssert.cs)	(revision 268c1647f0094f6c43aeceaa5793437562cffe5a)
+++ Ringtoets/Common/test/Ringtoets.Common.Data.TestUtil/CommonCloneAssert.cs	(.../CommonCloneAssert.cs)	(revision fb83f35cff901948b621ab14c2064590b33f17a0)
@@ -21,6 +21,7 @@
 
 using Core.Common.Data.TestUtil;
 using NUnit.Framework;
+using Ringtoets.Common.Data.Calculation;
 using Ringtoets.Common.Data.DikeProfiles;
 using Ringtoets.Common.Data.IllustrationPoints;
 using Ringtoets.Common.Data.Probability;
@@ -326,5 +327,34 @@
             CoreCloneAssert.AreObjectClones(original.InputParameters, clone.InputParameters, AreClones);
             CoreCloneAssert.AreObjectClones(original.Output, clone.Output, AreClones);
         }
+
+        /// <summary>
+        /// Method that asserts whether <paramref name="original"/> and <paramref name="clone"/>
+        /// are clones.
+        /// </summary>
+        /// <param name="original">The original object.</param>
+        /// <param name="clone">The cloned object.</param>
+        /// <exception cref="AssertionException">Thrown when <paramref name="original"/> and
+        /// <paramref name="clone"/> are not clones.</exception>
+        public static void AreEqual(CalculationGroup original, CalculationGroup clone)
+        {
+            Assert.AreEqual(original.Name, clone.Name);
+            Assert.AreEqual(original.IsNameEditable, clone.IsNameEditable);
+
+            CoreCloneAssert.AreEnumerationClones(original.Children, clone.Children, AreClones);
+        }
+
+        /// <summary>
+        /// Method that asserts whether <paramref name="original"/> and <paramref name="clone"/>
+        /// are clones.
+        /// </summary>
+        /// <param name="original">The original object.</param>
+        /// <param name="clone">The cloned object.</param>
+        /// <exception cref="AssertionException">Thrown when <paramref name="original"/> and
+        /// <paramref name="clone"/> are not clones.</exception>
+        private static void AreClones(ICalculationBase original, ICalculationBase clone)
+        {
+            Assert.AreEqual(original.Name, clone.Name);
+        }
     }
 }
\ No newline at end of file