Index: Riskeer/Common/src/Riskeer.Common.Forms/Factories/RiskeerGraphNodeFactory.cs
===================================================================
diff -u -r3265d1d674a16b70b7133f599bb1bc677d245784 -r1384e667040601d692d142d82705afecb2b0661e
--- Riskeer/Common/src/Riskeer.Common.Forms/Factories/RiskeerGraphNodeFactory.cs	(.../RiskeerGraphNodeFactory.cs)	(revision 3265d1d674a16b70b7133f599bb1bc677d245784)
+++ Riskeer/Common/src/Riskeer.Common.Forms/Factories/RiskeerGraphNodeFactory.cs	(.../RiskeerGraphNodeFactory.cs)	(revision 1384e667040601d692d142d82705afecb2b0661e)
@@ -30,6 +30,7 @@
 using Core.Common.Util;
 using Core.Components.PointedTree.Data;
 using Riskeer.Common.Data.IllustrationPoints;
+using Riskeer.Common.Forms.Helpers;
 using Riskeer.Common.Forms.Properties;
 
 namespace Riskeer.Common.Forms.Factories
@@ -161,9 +162,12 @@
 
         private static string CreateGraphNodeContent(RoundedDouble beta)
         {
+            double probability = StatisticsConverter.ReliabilityToProbability(beta);
+
             return string.Format(Resources.GraphNodeConverter_GraphNodeContent_Probability_0_Beta_1,
-                                 StatisticsConverter.ReliabilityToProbability(beta).ToString("0.##E+0", CultureInfo.CurrentCulture),
-                                 beta);
+                                 probability < 0.00001 ?
+                                 probability.ToString("0.#####E+0", CultureInfo.CurrentCulture) :
+                                 ProbabilityFormattingHelper.Format(StatisticsConverter.ReliabilityToProbability(beta)), beta);
         }
     }
 }
\ No newline at end of file
Index: Riskeer/Common/test/Riskeer.Common.Forms.Test/Factories/RiskeerGraphNodeFactoryTest.cs
===================================================================
diff -u -r8f9a9907d39bd6b9a9418aa2f34aee8b37522d40 -r1384e667040601d692d142d82705afecb2b0661e
--- Riskeer/Common/test/Riskeer.Common.Forms.Test/Factories/RiskeerGraphNodeFactoryTest.cs	(.../RiskeerGraphNodeFactoryTest.cs)	(revision 8f9a9907d39bd6b9a9418aa2f34aee8b37522d40)
+++ Riskeer/Common/test/Riskeer.Common.Forms.Test/Factories/RiskeerGraphNodeFactoryTest.cs	(.../RiskeerGraphNodeFactoryTest.cs)	(revision 1384e667040601d692d142d82705afecb2b0661e)
@@ -154,6 +154,44 @@
         }
 
         [Test]
+        [TestCase(1, "1/1")]
+        [TestCase(0.1, "1/10")]
+        [TestCase(0.00001, "1/100.000")]
+        [TestCase(0.000012, "1/83.332")]
+        [TestCase(0.00000123, "1,22998E-6")]
+        [TestCase(0.0000099, "9,90019E-6")]
+        public void CreateGraphNode_FaultTreeIllustrationPointNodeDataWithChildren_ReturnsExpectedGraphNodeContent(double probability, string expectedProbability)
+        {
+            // Setup
+            var random = new Random(31);
+            double beta = StatisticsConverter.ProbabilityToReliability(probability);
+            var illustrationPoint = new FaultTreeIllustrationPoint(
+                "Illustration Point",
+                beta,
+                Enumerable.Empty<Stochast>(),
+                random.NextEnumValue<CombinationType>());
+
+            IEnumerable<GraphNode> childGraphNodes = new[]
+            {
+                CreateTestGraphNode()
+            };
+
+            // Call
+            GraphNode graphNode = RiskeerGraphNodeFactory.CreateGraphNode(illustrationPoint,
+                                                                          childGraphNodes);
+
+            RoundedDouble roundedBeta = ((RoundedDouble) beta).ToPrecision(5);
+
+            string expectedGraphNodeContent = $"<text><bold>{illustrationPoint.Name}</bold>{Environment.NewLine}" +
+                                              $"{Environment.NewLine}" +
+                                              $"Berekende kans* = {expectedProbability}{Environment.NewLine}" +
+                                              $"Betrouwbaarheidsindex = {roundedBeta}</text>";
+
+            // Assert
+            Assert.AreEqual(expectedGraphNodeContent, graphNode.Content);
+        }
+
+        [Test]
         public void CreateGraphNode_WithFaultTreeIllustrationPointButChildrenNull_ThrowsArgumentNullException()
         {
             // Setup