Index: Ringtoets/HydraRing/src/Ringtoets.HydraRing.Calculation/Common/HydraRingCalculationData.cs
===================================================================
diff -u -r56f86024f7598b3d5dd16940ddfa96c4fc72592d -rdd610d07aa21d3a9b5dcdaa7013aaab0dce29143
--- Ringtoets/HydraRing/src/Ringtoets.HydraRing.Calculation/Common/HydraRingCalculationData.cs	(.../HydraRingCalculationData.cs)	(revision 56f86024f7598b3d5dd16940ddfa96c4fc72592d)
+++ Ringtoets/HydraRing/src/Ringtoets.HydraRing.Calculation/Common/HydraRingCalculationData.cs	(.../HydraRingCalculationData.cs)	(revision dd610d07aa21d3a9b5dcdaa7013aaab0dce29143)
@@ -19,6 +19,7 @@
 // Stichting Deltares and remain full property of Stichting Deltares at all times.
 // All rights reserved.
 
+using System.Collections.Generic;
 using Ringtoets.HydraRing.Calculation.Types;
 
 namespace Ringtoets.HydraRing.Calculation.Common
@@ -56,6 +57,17 @@
         }
 
         /// <summary>
+        /// Gets the variables to use during the calculation.
+        /// </summary>
+        public virtual IEnumerable<HydraRingVariable> Variables
+        {
+            get
+            {
+                yield break;
+            }
+        }
+
+        /// <summary>
         /// Gets the target reliability index to use during the calculation.
         /// </summary>
         /// <remarks>Only relevant for type 2 computations.</remarks>
Index: Ringtoets/HydraRing/src/Ringtoets.HydraRing.Calculation/Common/HydraRingVariable.cs
===================================================================
diff -u -r56f86024f7598b3d5dd16940ddfa96c4fc72592d -rdd610d07aa21d3a9b5dcdaa7013aaab0dce29143
--- Ringtoets/HydraRing/src/Ringtoets.HydraRing.Calculation/Common/HydraRingVariable.cs	(.../HydraRingVariable.cs)	(revision 56f86024f7598b3d5dd16940ddfa96c4fc72592d)
+++ Ringtoets/HydraRing/src/Ringtoets.HydraRing.Calculation/Common/HydraRingVariable.cs	(.../HydraRingVariable.cs)	(revision dd610d07aa21d3a9b5dcdaa7013aaab0dce29143)
@@ -26,7 +26,7 @@
     /// <summary>
     /// Container for Hydra-Ring variable related data.
     /// </summary>
-    internal abstract class HydraRingVariable
+    public abstract class HydraRingVariable
     {
         private readonly int variableId;
         private readonly HydraRingDistributionType distributionType;
Index: Ringtoets/HydraRing/src/Ringtoets.HydraRing.Calculation/Data/AssessmentLevelCalculationData.cs
===================================================================
diff -u -r907f25f4a15204ce1b1ba29d0ada4410d1914930 -rdd610d07aa21d3a9b5dcdaa7013aaab0dce29143
--- Ringtoets/HydraRing/src/Ringtoets.HydraRing.Calculation/Data/AssessmentLevelCalculationData.cs	(.../AssessmentLevelCalculationData.cs)	(revision 907f25f4a15204ce1b1ba29d0ada4410d1914930)
+++ Ringtoets/HydraRing/src/Ringtoets.HydraRing.Calculation/Data/AssessmentLevelCalculationData.cs	(.../AssessmentLevelCalculationData.cs)	(revision dd610d07aa21d3a9b5dcdaa7013aaab0dce29143)
@@ -19,6 +19,8 @@
 // Stichting Deltares and remain full property of Stichting Deltares at all times.
 // All rights reserved.
 
+using System.Collections.Generic;
+using Ringtoets.HydraRing.Calculation.Common;
 using Ringtoets.HydraRing.Calculation.Types;
 
 namespace Ringtoets.HydraRing.Calculation.Data
@@ -42,5 +44,18 @@
                 return HydraRingFailureMechanismType.AssessmentLevel;
             }
         }
+
+        public override IEnumerable<HydraRingVariable> Variables
+        {
+            get
+            {
+                yield return new AssessmentLevelVariable();
+            }
+        }
+
+        private class AssessmentLevelVariable : HydraRingVariable
+        {
+            public AssessmentLevelVariable() : base(26, 0, 0, 0, 0, 0, 0, 0) { }
+        }
     }
 }
\ No newline at end of file