Index: Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.Data/AssessmentSectionAssemblyCategoryGroup.cs
===================================================================
diff -u -r04bef178c846add660097aeab97e3d35aefd939b -r87391c51bc397ae140d3aca7940b4f5ac80cad35
--- Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.Data/AssessmentSectionAssemblyCategoryGroup.cs	(.../AssessmentSectionAssemblyCategoryGroup.cs)	(revision 04bef178c846add660097aeab97e3d35aefd939b)
+++ Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.Data/AssessmentSectionAssemblyCategoryGroup.cs	(.../AssessmentSectionAssemblyCategoryGroup.cs)	(revision 87391c51bc397ae140d3aca7940b4f5ac80cad35)
@@ -29,19 +29,28 @@
     /// </summary>
     public enum AssessmentSectionAssemblyCategoryGroup
     {
+        [ResourcesDisplayName(typeof(Resources), nameof(Resources.AssessmentSectionAssemblyCategoryGroup_None_DisplayName))]
+        None = 1,
+
         [ResourcesDisplayName(typeof(Resources), nameof(Resources.AssessmentSectionAssemblyCategoryGroup_APlus_DisplayName))]
-        APlus = 1,
+        APlus = 2,
 
         [ResourcesDisplayName(typeof(Resources), nameof(Resources.AssessmentSectionAssemblyCategoryGroup_A_DisplayName))]
-        A = 2,
+        A = 3,
 
         [ResourcesDisplayName(typeof(Resources), nameof(Resources.AssessmentSectionAssemblyCategoryGroup_B_DisplayName))]
-        B = 3,
+        B = 4,
 
         [ResourcesDisplayName(typeof(Resources), nameof(Resources.AssessmentSectionAssemblyCategoryGroup_C_DisplayName))]
-        C = 4,
+        C = 5,
 
         [ResourcesDisplayName(typeof(Resources), nameof(Resources.AssessmentSectionAssemblyCategoryGroup_D_DisplayName))]
-        D = 5
+        D = 6,
+
+        [ResourcesDisplayName(typeof(Resources), nameof(Resources.AssessmentSectionAssemblyCategoryGroup_NotApplicable_DisplayName))]
+        NotApplicable = 7,
+
+        [ResourcesDisplayName(typeof(Resources), nameof(Resources.AssessmentSectionAssemblyCategoryGroup_NotAssessed_DisplayName))]
+        NotAssessed = 8
     }
 }
\ No newline at end of file
Index: Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.Data/Properties/Resources.Designer.cs
===================================================================
diff -u -r04bef178c846add660097aeab97e3d35aefd939b -r87391c51bc397ae140d3aca7940b4f5ac80cad35
--- Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.Data/Properties/Resources.Designer.cs	(.../Resources.Designer.cs)	(revision 04bef178c846add660097aeab97e3d35aefd939b)
+++ Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.Data/Properties/Resources.Designer.cs	(.../Resources.Designer.cs)	(revision 87391c51bc397ae140d3aca7940b4f5ac80cad35)
@@ -125,5 +125,32 @@
                 return ResourceManager.GetString("AssessmentSectionAssemblyCategoryGroup_D_DisplayName", resourceCulture);
             }
         }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to .
+        /// </summary>
+        internal static string AssessmentSectionAssemblyCategoryGroup_None_DisplayName {
+            get {
+                return ResourceManager.GetString("AssessmentSectionAssemblyCategoryGroup_None_DisplayName", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to -.
+        /// </summary>
+        internal static string AssessmentSectionAssemblyCategoryGroup_NotApplicable_DisplayName {
+            get {
+                return ResourceManager.GetString("AssessmentSectionAssemblyCategoryGroup_NotApplicable_DisplayName", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to -.
+        /// </summary>
+        internal static string AssessmentSectionAssemblyCategoryGroup_NotAssessed_DisplayName {
+            get {
+                return ResourceManager.GetString("AssessmentSectionAssemblyCategoryGroup_NotAssessed_DisplayName", resourceCulture);
+            }
+        }
     }
 }
Index: Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.Data/Properties/Resources.resx
===================================================================
diff -u -r04bef178c846add660097aeab97e3d35aefd939b -r87391c51bc397ae140d3aca7940b4f5ac80cad35
--- Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.Data/Properties/Resources.resx	(.../Resources.resx)	(revision 04bef178c846add660097aeab97e3d35aefd939b)
+++ Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.Data/Properties/Resources.resx	(.../Resources.resx)	(revision 87391c51bc397ae140d3aca7940b4f5ac80cad35)
@@ -132,4 +132,13 @@
   <data name="AssessmentSectionAssemblyCategoryGroup_D_DisplayName" xml:space="preserve">
     <value>D</value>
   </data>
+  <data name="AssessmentSectionAssemblyCategoryGroup_None_DisplayName" xml:space="preserve">
+    <value />
+  </data>
+  <data name="AssessmentSectionAssemblyCategoryGroup_NotApplicable_DisplayName" xml:space="preserve">
+    <value>-</value>
+  </data>
+  <data name="AssessmentSectionAssemblyCategoryGroup_NotAssessed_DisplayName" xml:space="preserve">
+    <value>-</value>
+  </data>
 </root>
\ No newline at end of file
Index: Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.KernelWrapper/Creators/AssemblyCategoryCreator.cs
===================================================================
diff -u -rb82f25d8b29f8e35766758d4c71851d32833f65b -r87391c51bc397ae140d3aca7940b4f5ac80cad35
--- Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.KernelWrapper/Creators/AssemblyCategoryCreator.cs	(.../AssemblyCategoryCreator.cs)	(revision b82f25d8b29f8e35766758d4c71851d32833f65b)
+++ Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.KernelWrapper/Creators/AssemblyCategoryCreator.cs	(.../AssemblyCategoryCreator.cs)	(revision 87391c51bc397ae140d3aca7940b4f5ac80cad35)
@@ -115,8 +115,12 @@
                     return AssessmentSectionAssemblyCategoryGroup.B;
                 case EAssessmentGrade.C:
                     return AssessmentSectionAssemblyCategoryGroup.C;
-                case EAssessmentGrade.D:
-                    return AssessmentSectionAssemblyCategoryGroup.D;
+                case EAssessmentGrade.Gr:
+                    return AssessmentSectionAssemblyCategoryGroup.None;
+                case EAssessmentGrade.Ngo:
+                    return AssessmentSectionAssemblyCategoryGroup.NotAssessed;
+                case EAssessmentGrade.Nvt:
+                    return AssessmentSectionAssemblyCategoryGroup.NotApplicable;
                 default:
                     throw new NotSupportedException();
             }
Index: Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.Data.Test/AssessmentSectionAssemblyCategoryGroupTest.cs
===================================================================
diff -u -r04bef178c846add660097aeab97e3d35aefd939b -r87391c51bc397ae140d3aca7940b4f5ac80cad35
--- Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.Data.Test/AssessmentSectionAssemblyCategoryGroupTest.cs	(.../AssessmentSectionAssemblyCategoryGroupTest.cs)	(revision 04bef178c846add660097aeab97e3d35aefd939b)
+++ Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.Data.Test/AssessmentSectionAssemblyCategoryGroupTest.cs	(.../AssessmentSectionAssemblyCategoryGroupTest.cs)	(revision 87391c51bc397ae140d3aca7940b4f5ac80cad35)
@@ -35,20 +35,29 @@
                 return new Dictionary<AssessmentSectionAssemblyCategoryGroup, byte>
                 {
                     {
-                        AssessmentSectionAssemblyCategoryGroup.APlus, 1
+                        AssessmentSectionAssemblyCategoryGroup.None, 1
                     },
                     {
-                        AssessmentSectionAssemblyCategoryGroup.A, 2
+                        AssessmentSectionAssemblyCategoryGroup.APlus, 2
                     },
                     {
-                        AssessmentSectionAssemblyCategoryGroup.B, 3
+                        AssessmentSectionAssemblyCategoryGroup.A, 3
                     },
                     {
-                        AssessmentSectionAssemblyCategoryGroup.C, 4
+                        AssessmentSectionAssemblyCategoryGroup.B, 4
                     },
                     {
-                        AssessmentSectionAssemblyCategoryGroup.D, 5
-                    }
+                        AssessmentSectionAssemblyCategoryGroup.C, 5
+                    },
+                    {
+                        AssessmentSectionAssemblyCategoryGroup.D, 6
+                    },
+                    {
+                        AssessmentSectionAssemblyCategoryGroup.NotApplicable, 7
+                    },
+                    {
+                        AssessmentSectionAssemblyCategoryGroup.NotAssessed, 8
+                    },
                 };
             }
         }
@@ -60,6 +69,9 @@
                 return new Dictionary<AssessmentSectionAssemblyCategoryGroup, string>
                 {
                     {
+                        AssessmentSectionAssemblyCategoryGroup.None, ""
+                    },
+                    {
                         AssessmentSectionAssemblyCategoryGroup.APlus, "A+"
                     },
                     {
@@ -73,7 +85,13 @@
                     },
                     {
                         AssessmentSectionAssemblyCategoryGroup.D, "D"
-                    }
+                    },
+                    {
+                        AssessmentSectionAssemblyCategoryGroup.NotApplicable, "-"
+                    },
+                    {
+                        AssessmentSectionAssemblyCategoryGroup.NotAssessed, "-"
+                    },
                 };
             }
         }
Index: Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.KernelWrapper.TestUtil/AssemblyCategoryAssert.cs
===================================================================
diff -u -r038705e92738cd5d86e3aba9918a8dd749332e7c -r87391c51bc397ae140d3aca7940b4f5ac80cad35
--- Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.KernelWrapper.TestUtil/AssemblyCategoryAssert.cs	(.../AssemblyCategoryAssert.cs)	(revision 038705e92738cd5d86e3aba9918a8dd749332e7c)
+++ Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.KernelWrapper.TestUtil/AssemblyCategoryAssert.cs	(.../AssemblyCategoryAssert.cs)	(revision 87391c51bc397ae140d3aca7940b4f5ac80cad35)
@@ -83,6 +83,12 @@
                     return AssessmentSectionAssemblyCategoryGroup.C;
                 case EAssessmentGrade.D:
                     return AssessmentSectionAssemblyCategoryGroup.D;
+                case EAssessmentGrade.Gr:
+                    return AssessmentSectionAssemblyCategoryGroup.None;
+                case EAssessmentGrade.Ngo:
+                    return AssessmentSectionAssemblyCategoryGroup.NotAssessed;
+                case EAssessmentGrade.Nvt:
+                    return AssessmentSectionAssemblyCategoryGroup.NotApplicable;
                 default:
                     throw new NotSupportedException();
             }
Index: Ringtoets/Common/src/Ringtoets.Common.Forms/Helpers/AssemblyCategoryGroupColorHelper.cs
===================================================================
diff -u -rf147b624dadd780d3186ec19c301d9ed1634504e -r87391c51bc397ae140d3aca7940b4f5ac80cad35
--- Ringtoets/Common/src/Ringtoets.Common.Forms/Helpers/AssemblyCategoryGroupColorHelper.cs	(.../AssemblyCategoryGroupColorHelper.cs)	(revision f147b624dadd780d3186ec19c301d9ed1634504e)
+++ Ringtoets/Common/src/Ringtoets.Common.Forms/Helpers/AssemblyCategoryGroupColorHelper.cs	(.../AssemblyCategoryGroupColorHelper.cs)	(revision 87391c51bc397ae140d3aca7940b4f5ac80cad35)
@@ -61,6 +61,10 @@
                     return Color.FromArgb(255, 153, 0);
                 case AssessmentSectionAssemblyCategoryGroup.D:
                     return Color.FromArgb(255, 0, 0);
+                case AssessmentSectionAssemblyCategoryGroup.None:
+                case AssessmentSectionAssemblyCategoryGroup.NotApplicable:
+                case AssessmentSectionAssemblyCategoryGroup.NotAssessed:
+                    return Color.White;
                 default:
                     throw new NotSupportedException();
             }
Index: Ringtoets/Common/test/Ringtoets.Common.Forms.TestUtil.Test/AssemblyCategoryGroupTestHelperTest.cs
===================================================================
diff -u -rf147b624dadd780d3186ec19c301d9ed1634504e -r87391c51bc397ae140d3aca7940b4f5ac80cad35
--- Ringtoets/Common/test/Ringtoets.Common.Forms.TestUtil.Test/AssemblyCategoryGroupTestHelperTest.cs	(.../AssemblyCategoryGroupTestHelperTest.cs)	(revision f147b624dadd780d3186ec19c301d9ed1634504e)
+++ Ringtoets/Common/test/Ringtoets.Common.Forms.TestUtil.Test/AssemblyCategoryGroupTestHelperTest.cs	(.../AssemblyCategoryGroupTestHelperTest.cs)	(revision 87391c51bc397ae140d3aca7940b4f5ac80cad35)
@@ -71,7 +71,10 @@
                 new TestCaseData(AssessmentSectionAssemblyCategoryGroup.A, Color.FromArgb(118, 147, 60)),
                 new TestCaseData(AssessmentSectionAssemblyCategoryGroup.B, Color.FromArgb(255, 255, 0)),
                 new TestCaseData(AssessmentSectionAssemblyCategoryGroup.C, Color.FromArgb(255, 153, 0)),
-                new TestCaseData(AssessmentSectionAssemblyCategoryGroup.D, Color.FromArgb(255, 0, 0))
+                new TestCaseData(AssessmentSectionAssemblyCategoryGroup.D, Color.FromArgb(255, 0, 0)),
+                new TestCaseData(AssessmentSectionAssemblyCategoryGroup.None, Color.White),
+                new TestCaseData(AssessmentSectionAssemblyCategoryGroup.NotAssessed, Color.White),
+                new TestCaseData(AssessmentSectionAssemblyCategoryGroup.NotApplicable, Color.White)
             };
 
             Assert.AreEqual(expectedCases.Length, testCases.Count());
Index: Ringtoets/Common/test/Ringtoets.Common.Forms.TestUtil/AssemblyCategoryColorTestHelper.cs
===================================================================
diff -u -r6e0c3a3eec9feb30d964df279e76f2a8e6ae278f -r87391c51bc397ae140d3aca7940b4f5ac80cad35
--- Ringtoets/Common/test/Ringtoets.Common.Forms.TestUtil/AssemblyCategoryColorTestHelper.cs	(.../AssemblyCategoryColorTestHelper.cs)	(revision 6e0c3a3eec9feb30d964df279e76f2a8e6ae278f)
+++ Ringtoets/Common/test/Ringtoets.Common.Forms.TestUtil/AssemblyCategoryColorTestHelper.cs	(.../AssemblyCategoryColorTestHelper.cs)	(revision 87391c51bc397ae140d3aca7940b4f5ac80cad35)
@@ -64,6 +64,9 @@
                 yield return new TestCaseData(AssessmentSectionAssemblyCategoryGroup.B, Color.FromArgb(255, 255, 0));
                 yield return new TestCaseData(AssessmentSectionAssemblyCategoryGroup.C, Color.FromArgb(255, 153, 0));
                 yield return new TestCaseData(AssessmentSectionAssemblyCategoryGroup.D, Color.FromArgb(255, 0, 0));
+                yield return new TestCaseData(AssessmentSectionAssemblyCategoryGroup.None, Color.White);
+                yield return new TestCaseData(AssessmentSectionAssemblyCategoryGroup.NotAssessed, Color.White);
+                yield return new TestCaseData(AssessmentSectionAssemblyCategoryGroup.NotApplicable, Color.White);
             }
         }
     }