Index: Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Data/MacroStabilityInwardsFailureMechanismSectionResult.cs
===================================================================
diff -u -rb6e0f8d41d92ed18c902138dd49cce6e703ee883 -rb5a3ccef1cfc5e4cbfea0a97a8a9ee8ae5a199e2
--- Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Data/MacroStabilityInwardsFailureMechanismSectionResult.cs	(.../MacroStabilityInwardsFailureMechanismSectionResult.cs)	(revision b6e0f8d41d92ed18c902138dd49cce6e703ee883)
+++ Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Data/MacroStabilityInwardsFailureMechanismSectionResult.cs	(.../MacroStabilityInwardsFailureMechanismSectionResult.cs)	(revision b5a3ccef1cfc5e4cbfea0a97a8a9ee8ae5a199e2)
@@ -32,17 +32,34 @@
     /// </summary>
     public class MacroStabilityInwardsFailureMechanismSectionResult : FailureMechanismSectionResult
     {
+        private RoundedDouble assessmentLayerThree;
+
         /// <summary>
         /// Creates a new instance of <see cref="MacroStabilityInwardsFailureMechanismSectionResult"/>.
         /// </summary>
         /// <param name="section">The <see cref="FailureMechanismSection"/> to get the result from.</param>
         /// <exception cref="ArgumentNullException">Thrown when <paramref name="section"/> is <c>null</c>.</exception>
-        public MacroStabilityInwardsFailureMechanismSectionResult(FailureMechanismSection section) : base(section) {}
+        public MacroStabilityInwardsFailureMechanismSectionResult(FailureMechanismSection section) : base(section)
+        {
+            AssessmentLayerThree = RoundedDouble.NaN;
+        }
 
-        protected override RoundedDouble ValidateAssessmentLayerThree(RoundedDouble value)
+        /// <summary>
+        /// Gets or sets the value of the tailored assessment of safety.
+        /// </summary>
+        /// <exception cref="ArgumentOutOfRangeException">Thrown when 
+        /// <paramref name="value"/> is outside of the valid ranges.</exception>
+        public RoundedDouble AssessmentLayerThree
         {
-            ProbabilityHelper.ValidateProbability(value, null, true);
-            return value;
+            get
+            {
+                return assessmentLayerThree;
+            }
+            set
+            {
+                ProbabilityHelper.ValidateProbability(value, null, true);
+                assessmentLayerThree = value;
+            }
         }
     }
 }
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