Index: Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingProbabilityAssessmentInput.cs
===================================================================
diff -u -rfcc734ebbc1e5c6c02ae2dae2a184fdcb9aa4d1b -rc09b65e09c7af06495433e73530b900c46414392
--- Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingProbabilityAssessmentInput.cs	(.../PipingProbabilityAssessmentInput.cs)	(revision fcc734ebbc1e5c6c02ae2dae2a184fdcb9aa4d1b)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingProbabilityAssessmentInput.cs	(.../PipingProbabilityAssessmentInput.cs)	(revision c09b65e09c7af06495433e73530b900c46414392)
@@ -19,28 +19,48 @@
 // Stichting Deltares and remain full property of Stichting Deltares at all times.
 // All rights reserved.
 
+using System;
+using Core.Common.Base.Properties;
+
 namespace Ringtoets.Piping.Data
 {
     /// <summary>
     /// This class holds parameters which influence the probability estimate for a piping assessment.
     /// </summary>
     public class PipingProbabilityAssessmentInput
     {
+        private double a;
+
         /// <summary>
         /// Creates a new instance of <see cref="PipingProbabilityAssessmentInput"/>.
         /// </summary>
         public PipingProbabilityAssessmentInput()
         {
-            A = 1.0;
-            B = 350.0;
+            A = 0.4;
+            B = 300.0;
             SectionLength = double.NaN;
         }
 
         /// <summary>
         /// Gets 'a' parameter used to factor in the 'length effect' when determining the
         /// maximum tolerated probability of failure.
         /// </summary>
-        public double A { get; private set; }
+        public double A
+        {
+            get
+            {
+                return a;
+            }
+            set
+            {
+                if (!(value >= 0) || !(value <= 1))
+                {
+                    throw new ArgumentException(Resources.PipingProbabilityAssessmentInput_A_Value_must_be_between_zero_and_one);
+                }
+                
+                a = value;
+            }
+        }
 
         /// <summary>
         /// Gets 'b' parameter used to factor in the 'length effect' when determining the