Index: Riskeer/Common/src/Riskeer.Common.Data/FailureMechanism/FailureMechanismSectionResult.cs
===================================================================
diff -u -rd8e61e1c316db2f6f06f05f4911fd26ea072a0a1 -r54c12cd1360987abd052df8dbe9bc1bdb9990857
--- Riskeer/Common/src/Riskeer.Common.Data/FailureMechanism/FailureMechanismSectionResult.cs	(.../FailureMechanismSectionResult.cs)	(revision d8e61e1c316db2f6f06f05f4911fd26ea072a0a1)
+++ Riskeer/Common/src/Riskeer.Common.Data/FailureMechanism/FailureMechanismSectionResult.cs	(.../FailureMechanismSectionResult.cs)	(revision 54c12cd1360987abd052df8dbe9bc1bdb9990857)
@@ -32,6 +32,7 @@
     public abstract class FailureMechanismSectionResult : Observable
     {
         private double manualInitialFailureMechanismResultSectionProbability;
+        private double refinedSectionProbability;
 
         /// <summary>
         /// Creates a new instance of <see cref="FailureMechanismSectionResult"/>.
@@ -49,6 +50,7 @@
             IsRelevant = true;
             InitialFailureMechanismResult = InitialFailureMechanismResultType.Adopt;
             ManualInitialFailureMechanismResultSectionProbability = double.NaN;
+            RefinedSectionProbability = double.NaN;
         }
 
         /// <summary>
@@ -81,5 +83,26 @@
                 manualInitialFailureMechanismResultSectionProbability = value;
             }
         }
+
+        /// <summary>
+        /// Gets or sets whether further analysis is needed.
+        /// </summary>
+        public bool FurtherAnalysisNeeded { get; set; }
+        
+        /// <summary>
+        /// Gets or sets the value of the refined probability.
+        /// </summary>
+        /// <exception cref="ArgumentOutOfRangeException">Thrown when <paramref name="value"/> is not in range [0,1].</exception>
+        public double RefinedSectionProbability
+        {
+            get => refinedSectionProbability;
+            set
+            {
+                ProbabilityHelper.ValidateProbability(value, null,
+                                                      Resources.ArbitraryProbabilityFailureMechanismSectionResult_AssessmentProbability_Value_needs_to_be_in_Range_0_,
+                                                      true);
+                refinedSectionProbability = value;
+            }
+        }
     }
 }
\ No newline at end of file
Index: Riskeer/Common/test/Riskeer.Common.Data.Test/FailureMechanism/FailureMechanismSectionResultTest.cs
===================================================================
diff -u -rd8e61e1c316db2f6f06f05f4911fd26ea072a0a1 -r54c12cd1360987abd052df8dbe9bc1bdb9990857
--- Riskeer/Common/test/Riskeer.Common.Data.Test/FailureMechanism/FailureMechanismSectionResultTest.cs	(.../FailureMechanismSectionResultTest.cs)	(revision d8e61e1c316db2f6f06f05f4911fd26ea072a0a1)
+++ Riskeer/Common/test/Riskeer.Common.Data.Test/FailureMechanism/FailureMechanismSectionResultTest.cs	(.../FailureMechanismSectionResultTest.cs)	(revision 54c12cd1360987abd052df8dbe9bc1bdb9990857)
@@ -46,6 +46,8 @@
             Assert.IsTrue(sectionResult.IsRelevant);
             Assert.AreEqual(InitialFailureMechanismResultType.Adopt, sectionResult.InitialFailureMechanismResult);
             Assert.IsNaN(sectionResult.ManualInitialFailureMechanismResultSectionProbability);
+            Assert.IsFalse(sectionResult.FurtherAnalysisNeeded);
+            Assert.IsNaN(sectionResult.RefinedSectionProbability);
         }
 
         [Test]
@@ -98,7 +100,47 @@
             // Assert
             Assert.AreEqual(newValue, result.ManualInitialFailureMechanismResultSectionProbability);
         }
+        
+        [Test]
+        [SetCulture("nl-NL")]
+        [TestCase(-20)]
+        [TestCase(-1e-6)]
+        [TestCase(1 + 1e-6)]
+        [TestCase(12)]
+        public void RefinedSectionProbability_InvalidValue_ThrowsArgumentOutOfRangeException(double newValue)
+        {
+            // Setup
+            FailureMechanismSection section = FailureMechanismSectionTestFactory.CreateFailureMechanismSection();
+            var result = new TestFailureMechanismSectionResult(section);
 
+            // Call
+            void Call() => result.RefinedSectionProbability = newValue;
+
+            // Assert
+            const string message = "De waarde voor de faalkans moet in het bereik [0,0, 1,0] liggen.";
+            TestHelper.AssertThrowsArgumentExceptionAndTestMessage<ArgumentOutOfRangeException>(Call, message);
+        }
+
+        [Test]
+        [TestCase(0)]
+        [TestCase(1e-6)]
+        [TestCase(0.5)]
+        [TestCase(1 - 1e-6)]
+        [TestCase(1)]
+        [TestCase(double.NaN)]
+        public void RefinedSectionProbability_ValidValue_NewValueSet(double newValue)
+        {
+            // Setup
+            FailureMechanismSection section = FailureMechanismSectionTestFactory.CreateFailureMechanismSection();
+            var result = new TestFailureMechanismSectionResult(section);
+
+            // Call
+            result.RefinedSectionProbability = newValue;
+
+            // Assert
+            Assert.AreEqual(newValue, result.RefinedSectionProbability);
+        }
+
         private class TestFailureMechanismSectionResult : FailureMechanismSectionResult
         {
             public TestFailureMechanismSectionResult(FailureMechanismSection section) : base(section) {}