diff --git a/TestStack.ConventionTests.Tests/TypeBasedConventions.cs b/TestStack.ConventionTests.Tests/TypeBasedConventions.cs
index 27d0aa5..c975a3d 100644
--- a/TestStack.ConventionTests.Tests/TypeBasedConventions.cs
+++ b/TestStack.ConventionTests.Tests/TypeBasedConventions.cs
@@ -5,7 +5,6 @@
     using ApprovalTests.Reporters;
     using NUnit.Framework;
     using TestAssembly;
-    using TestAssembly.Dtos;
     using TestStack.ConventionTests.ConventionData;
     using TestStack.ConventionTests.Conventions;
 
@@ -17,13 +16,8 @@ public class TypeBasedConventions
 
         public TypeBasedConventions()
         {
-            var itemsToVerify = typeof (SampleDomainClass).Assembly.GetTypes()
-                .Where(t => t.IsClass && t.Namespace == typeof (SampleDomainClass).Namespace)
-                .ToArray();
-            nhibernateEntities = new Types("nHibernate Entitites")
-            {
-                TypesToVerify = itemsToVerify
-            };
+            nhibernateEntities = Types.InAssemblyOf<SampleDomainClass>("nHibernate Entitites",
+                types => types.Where(t => t.IsConcreteClass() && t.Namespace == typeof (SampleDomainClass).Namespace));
         }
 
         [Test]
@@ -57,10 +51,7 @@ public void all_methods_are_virtual_wth_approved_exceptions()
         [Test]
         public void dtos_exists_in_dto_namespace()
         {
-            var types = new Types("TestAssembly types")
-            {
-                TypesToVerify = new[] { typeof(SomeDto), typeof(BlahDto), typeof(AnotherClass)}
-            };
+            var types = Types.InAssemblyOf<SomeDto>();
             var convention = new ClassTypeHasSpecificNamespace(t => t.Name.EndsWith("Dto"), "TestAssembly.Dtos", "Dto");
 
             var ex = Assert.Throws<ConventionFailedException>(() =>Convention.Is(convention, types));
@@ -70,10 +61,7 @@ public void dtos_exists_in_dto_namespace()
         [Test]
         public void dtos_exists_in_dto_namespace_wth_approved_exceptions()
         {
-            var types = new Types("TestAssembly types")
-            {
-                TypesToVerify = new[] { typeof(SomeDto), typeof(BlahDto), typeof(AnotherClass) }
-            };
+            var types = Types.InAssemblyOf<SomeDto>();
             var convention = new ClassTypeHasSpecificNamespace(t => t.Name.EndsWith("Dto"), "TestAssembly.Dtos", "Dto");
 
             Convention.IsWithApprovedExeptions(convention, types);
diff --git a/TestStack.ConventionTests.Tests/TypeBasedConventions.dtos_exists_in_dto_namespace.approved.txt b/TestStack.ConventionTests.Tests/TypeBasedConventions.dtos_exists_in_dto_namespace.approved.txt
index fc2936a..d0deea5 100644
--- a/TestStack.ConventionTests.Tests/TypeBasedConventions.dtos_exists_in_dto_namespace.approved.txt
+++ b/TestStack.ConventionTests.Tests/TypeBasedConventions.dtos_exists_in_dto_namespace.approved.txt
@@ -1,9 +1,9 @@
-'Dtos must be under the 'TestAssembly.Dtos' namespace' for 'TestAssembly types'
--------------------------------------------------------------------------------
+'Dtos must be under the 'TestAssembly.Dtos' namespace' for 'TestAssembly'
+-------------------------------------------------------------------------
 
 	TestAssembly.SomeDto
 
-'Non-Dtos must not be under the 'TestAssembly.Dtos' namespace' for 'TestAssembly types'
----------------------------------------------------------------------------------------
+'Non-Dtos must not be under the 'TestAssembly.Dtos' namespace' for 'TestAssembly'
+---------------------------------------------------------------------------------
 
 	TestAssembly.Dtos.AnotherClass
diff --git a/TestStack.ConventionTests.Tests/TypeBasedConventions.dtos_exists_in_dto_namespace_wth_approved_exceptions.approved.txt b/TestStack.ConventionTests.Tests/TypeBasedConventions.dtos_exists_in_dto_namespace_wth_approved_exceptions.approved.txt
index 6281d35..547d592 100644
--- a/TestStack.ConventionTests.Tests/TypeBasedConventions.dtos_exists_in_dto_namespace_wth_approved_exceptions.approved.txt
+++ b/TestStack.ConventionTests.Tests/TypeBasedConventions.dtos_exists_in_dto_namespace_wth_approved_exceptions.approved.txt
@@ -1,4 +1,4 @@
-'Dtos must be under the 'TestAssembly.Dtos' namespace' for 'TestAssembly types'
--------------------------------------------------------------------------------
+'Dtos must be under the 'TestAssembly.Dtos' namespace' for 'TestAssembly'
+-------------------------------------------------------------------------
 
 	TestAssembly.SomeDto
diff --git a/TestStack.ConventionTests.Tests/TypeBasedConventions.dtos_exists_in_dto_namespace_wth_approved_exceptions1.approved.txt b/TestStack.ConventionTests.Tests/TypeBasedConventions.dtos_exists_in_dto_namespace_wth_approved_exceptions1.approved.txt
index 5a005e3..faaec50 100644
--- a/TestStack.ConventionTests.Tests/TypeBasedConventions.dtos_exists_in_dto_namespace_wth_approved_exceptions1.approved.txt
+++ b/TestStack.ConventionTests.Tests/TypeBasedConventions.dtos_exists_in_dto_namespace_wth_approved_exceptions1.approved.txt
@@ -1,4 +1,4 @@
-'Non-Dtos must not be under the 'TestAssembly.Dtos' namespace' for 'TestAssembly types'
----------------------------------------------------------------------------------------
+'Non-Dtos must not be under the 'TestAssembly.Dtos' namespace' for 'TestAssembly'
+---------------------------------------------------------------------------------
 
 	TestAssembly.Dtos.AnotherClass
diff --git a/TestStack.ConventionTests/ConventionData/TypeExtensions.cs b/TestStack.ConventionTests/ConventionData/TypeExtensions.cs
new file mode 100644
index 0000000..93a8ea8
--- /dev/null
+++ b/TestStack.ConventionTests/ConventionData/TypeExtensions.cs
@@ -0,0 +1,70 @@
+namespace TestStack.ConventionTests.ConventionData
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using System.Reflection;
+
+    public static class TypeExtensions
+    {
+        public static bool IsConcreteClass(this Type t)
+        {
+            return t.IsClass && !t.IsAbstract;
+        }
+
+        public static bool IsEnum(this Type type)
+        {
+            return typeof(Enum).IsAssignableFrom(type);
+        }
+
+        public static bool IsStatic(this Type type)
+        {
+            return type.IsClass && !(type.IsSealed && type.IsAbstract);
+        }
+
+        public static bool HasDefaultConstructor(this Type type)
+        {
+            return type.GetConstructors(BindingFlags.Public | BindingFlags.Instance | BindingFlags.NonPublic |
+                                        BindingFlags.DeclaredOnly)
+                .Any(constructorInfo => constructorInfo.GetParameters().Length == 0 && !constructorInfo.IsPrivate);
+        }
+
+        public static bool HasPublicDefaultConstructor(this Type type)
+        {
+            return type.GetConstructors(BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly)
+                .Any(constructorInfo => constructorInfo.GetParameters().Length == 0);
+        }
+
+        public static bool AssignableTo<TAssignableTo>(this Type type)
+        {
+            return typeof(TAssignableTo).IsAssignableFrom(type);
+        }
+
+        public static IEnumerable<MethodInfo> NonVirtualMethods(this Type type)
+        {
+            var methodInfos =
+                type.GetMethods(BindingFlags.Public | BindingFlags.Instance | BindingFlags.NonPublic |
+                                BindingFlags.DeclaredOnly);
+            return methodInfos.Where(methodInfo =>
+                !methodInfo.IsPrivate &&
+                methodInfo.DeclaringType == type &&
+                !methodInfo.Name.StartsWith("<"))
+                .Where(methodInfo => methodInfo.Name != "Equals")
+                .Where(methodInfo => !methodInfo.IsVirtual || methodInfo.IsFinal);
+        }
+
+        public static IEnumerable<Type> GetClosedInterfacesOf(this Type type, Type openGeneric)
+        {
+            return from i in type.GetInterfaces()
+                   where i.IsGenericType
+                   let defn = i.GetGenericTypeDefinition()
+                   where defn == openGeneric
+                   select i;
+        }
+
+        public static bool ClosesInterface(this Type t, Type openGeneric)
+        {
+            return t.GetClosedInterfacesOf(openGeneric).Any();
+        }
+    }
+}
\ No newline at end of file
diff --git a/TestStack.ConventionTests/ConventionData/Types.cs b/TestStack.ConventionTests/ConventionData/Types.cs
index e491811..9452403 100644
--- a/TestStack.ConventionTests/ConventionData/Types.cs
+++ b/TestStack.ConventionTests/ConventionData/Types.cs
@@ -1,6 +1,8 @@
 namespace TestStack.ConventionTests.ConventionData
 {
     using System;
+    using System.Collections;
+    using System.Collections.Generic;
     using System.Linq;
 
     /// <summary>
@@ -18,5 +20,23 @@ public Types(string descriptionOfTypes)
         public string Description { get; private set; }
 
         public bool HasData {get { return TypesToVerify.Any(); }}
+
+        public static Types InAssemblyOf<T>()
+        {
+            var assembly = typeof(T).Assembly;
+            return new Types(assembly.GetName().Name)
+            {
+                TypesToVerify = assembly.GetTypes()
+            };
+        }
+
+        public static Types InAssemblyOf<T>(string descriptionOfTypes, Func<IEnumerable<Type>, IEnumerable<Type>> types)
+        {
+            var assembly = typeof (T).Assembly;
+            return new Types(descriptionOfTypes)
+            {
+                TypesToVerify = types(assembly.GetTypes()).ToArray()
+            };
+        }
     }
 }
\ No newline at end of file
diff --git a/TestStack.ConventionTests/Conventions/AllClassesHaveDefaultConstructor.cs b/TestStack.ConventionTests/Conventions/AllClassesHaveDefaultConstructor.cs
index 4de15e4..28edb3c 100644
--- a/TestStack.ConventionTests/Conventions/AllClassesHaveDefaultConstructor.cs
+++ b/TestStack.ConventionTests/Conventions/AllClassesHaveDefaultConstructor.cs
@@ -2,7 +2,6 @@
 {
     using System.Linq;
     using TestStack.ConventionTests.ConventionData;
-    using TestStack.ConventionTests.Internal;
 
     public class AllClassesHaveDefaultConstructor : IConvention<Types>
     {
diff --git a/TestStack.ConventionTests/Conventions/AllMethodsAreVirtual.cs b/TestStack.ConventionTests/Conventions/AllMethodsAreVirtual.cs
index 70d7fd9..4dbd3c2 100644
--- a/TestStack.ConventionTests/Conventions/AllMethodsAreVirtual.cs
+++ b/TestStack.ConventionTests/Conventions/AllMethodsAreVirtual.cs
@@ -2,7 +2,6 @@
 {
     using System.Linq;
     using TestStack.ConventionTests.ConventionData;
-    using TestStack.ConventionTests.Internal;
 
     public class AllMethodsAreVirtual : IConvention<Types>
     {
diff --git a/TestStack.ConventionTests/Internal/ReflectionExtensions.cs b/TestStack.ConventionTests/Internal/ReflectionExtensions.cs
index f078c18..cc700f5 100644
--- a/TestStack.ConventionTests/Internal/ReflectionExtensions.cs
+++ b/TestStack.ConventionTests/Internal/ReflectionExtensions.cs
@@ -43,56 +43,5 @@ public static Type[] SafeGetTypes(this Assembly assembly)
                 return Array.FindAll(ex.Types, x => x != null);
             }
         }
-
-        public static bool IsEnum(this Type type)
-        {
-            return typeof (Enum).IsAssignableFrom(type);
-        }
-
-        public static bool HasAttribute<TAttribute>(this Type type, bool inherit = true) where TAttribute : Attribute
-        {
-            return type.GetCustomAttributes(typeof (TAttribute), inherit).Length > 0;
-        }
-
-        public static bool IsStatic(this Type type)
-        {
-            return type.IsClass && !(type.IsSealed && type.IsAbstract);
-        }
-
-        public static bool HasDefaultConstructor(this Type type)
-        {
-            return type.GetConstructors(BindingFlags.Public | BindingFlags.Instance | BindingFlags.NonPublic |
-                                        BindingFlags.DeclaredOnly)
-                .Any(constructorInfo => constructorInfo.GetParameters().Length == 0 && !constructorInfo.IsPrivate);
-        }
-
-        public static bool HasPublicDefaultConstructor(this Type type)
-        {
-            return type.GetConstructors(BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly)
-                .Any(constructorInfo => constructorInfo.GetParameters().Length == 0);
-        }
-
-        public static bool AssignableTo<TAssignableTo>(this Type type)
-        {
-            return typeof (TAssignableTo).IsAssignableFrom(type);
-        }
-
-        public static IEnumerable<Type> ConcreteTypes(this IEnumerable<Type> types)
-        {
-            return types.Where(t => t.IsClass && !t.IsAbstract);
-        }
-
-        public static IEnumerable<MethodInfo> NonVirtualMethods(this Type type)
-        {
-            var methodInfos =
-                type.GetMethods(BindingFlags.Public | BindingFlags.Instance | BindingFlags.NonPublic |
-                                BindingFlags.DeclaredOnly);
-            return methodInfos .Where(methodInfo =>
-                    !methodInfo.IsPrivate && 
-                    methodInfo.DeclaringType == type && 
-                    !methodInfo.Name.StartsWith("<"))
-                .Where(methodInfo => methodInfo.Name != "Equals")
-                .Where(methodInfo => !methodInfo.IsVirtual || methodInfo.IsFinal);
-        }
     }
 }
\ No newline at end of file
diff --git a/TestStack.ConventionTests/TestStack.ConventionTests.csproj b/TestStack.ConventionTests/TestStack.ConventionTests.csproj
index 24ea926..8872291 100644
--- a/TestStack.ConventionTests/TestStack.ConventionTests.csproj
+++ b/TestStack.ConventionTests/TestStack.ConventionTests.csproj
@@ -58,6 +58,7 @@
     <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="ConventionData\TypeExtensions.cs" />
     <Compile Include="ConventionFailedException.cs" />
     <Compile Include="IConventionResultContext.cs" />
     <Compile Include="Internal\ConventionReportFailure.cs" />
@@ -121,6 +122,6 @@
   </Target>
   -->
   <Target Name="AfterBuild">
-    <Copy SourceFiles="..\Readme.md" DestinationFiles="$(OutputPath)\Readme.txt" />
+    <Copy SourceFiles="..\Readme.md" DestinationFiles="$(OutputPath)\Readme.txt" Condition="'$(NCrunch)' != '1'" />
   </Target>
 </Project>
\ No newline at end of file