diff --git a/TestAssembly/Collections/Branch.cs b/TestAssembly/Collections/Branch.cs
new file mode 100644
index 0000000..0530072
--- /dev/null
+++ b/TestAssembly/Collections/Branch.cs
@@ -0,0 +1,20 @@
+namespace TestAssembly.Collections
+{
+    using System.Collections;
+    using System.Collections.Generic;
+
+    public class Branch : IEnumerable<Leaf>
+    {
+        readonly List<Leaf> items = new List<Leaf>();
+
+        public IEnumerator<Leaf> GetEnumerator()
+        {
+            return items.GetEnumerator();
+        }
+
+        IEnumerator IEnumerable.GetEnumerator()
+        {
+            return GetEnumerator();
+        }
+    }
+}
\ No newline at end of file
diff --git a/TestAssembly/Collections/Forest.cs b/TestAssembly/Collections/Forest.cs
new file mode 100644
index 0000000..cff3c49
--- /dev/null
+++ b/TestAssembly/Collections/Forest.cs
@@ -0,0 +1,30 @@
+namespace TestAssembly.Collections
+{
+    using System.Collections;
+    using System.Collections.Generic;
+
+    public class Forest : ICanAdd<Tree>, ICanRemove<Tree>
+    {
+        readonly List<Tree> items = new List<Tree>();
+
+        public void Add(Tree item)
+        {
+            items.Add(item);
+        }
+
+        IEnumerator IEnumerable.GetEnumerator()
+        {
+            return ((IEnumerable) items).GetEnumerator();
+        }
+
+        public IEnumerator<Tree> GetEnumerator()
+        {
+            return items.GetEnumerator();
+        }
+
+        public bool Remove(Tree item)
+        {
+            return items.Remove(item);
+        }
+    }
+}
\ No newline at end of file
diff --git a/TestAssembly/Collections/ICanAdd.cs b/TestAssembly/Collections/ICanAdd.cs
new file mode 100644
index 0000000..1115878
--- /dev/null
+++ b/TestAssembly/Collections/ICanAdd.cs
@@ -0,0 +1,9 @@
+namespace TestAssembly.Collections
+{
+    using System.Collections.Generic;
+
+    public interface ICanAdd<T> : IEnumerable<T>
+    {
+        void Add(T item);
+    }
+}
\ No newline at end of file
diff --git a/TestAssembly/Collections/ICanRemove.cs b/TestAssembly/Collections/ICanRemove.cs
new file mode 100644
index 0000000..23cd643
--- /dev/null
+++ b/TestAssembly/Collections/ICanRemove.cs
@@ -0,0 +1,9 @@
+namespace TestAssembly.Collections
+{
+    using System.Collections.Generic;
+
+    public interface ICanRemove<T> : IEnumerable<T>
+    {
+        bool Remove(T item);
+    }
+}
\ No newline at end of file
diff --git a/TestAssembly/Collections/Leaf.cs b/TestAssembly/Collections/Leaf.cs
new file mode 100644
index 0000000..42dfd08
--- /dev/null
+++ b/TestAssembly/Collections/Leaf.cs
@@ -0,0 +1,6 @@
+namespace TestAssembly.Collections
+{
+    public class Leaf
+    {
+    }
+}
\ No newline at end of file
diff --git a/TestAssembly/Collections/Tree.cs b/TestAssembly/Collections/Tree.cs
new file mode 100644
index 0000000..e8da998
--- /dev/null
+++ b/TestAssembly/Collections/Tree.cs
@@ -0,0 +1,31 @@
+namespace TestAssembly.Collections
+{
+    using System.Collections;
+    using System.Collections.Generic;
+    using System.Linq;
+
+    public class Tree : ICanAdd<Branch>, IEnumerable<Leaf>
+    {
+        readonly List<Branch> items = new List<Branch>();
+
+        public void Add(Branch item)
+        {
+            items.Add(item);
+        }
+
+        public IEnumerator<Branch> GetEnumerator()
+        {
+            return items.GetEnumerator();
+        }
+
+        IEnumerator IEnumerable.GetEnumerator()
+        {
+            return GetEnumerator();
+        }
+
+        IEnumerator<Leaf> IEnumerable<Leaf>.GetEnumerator()
+        {
+            return items.SelectMany(i => i).GetEnumerator();
+        }
+    }
+}
\ No newline at end of file
diff --git a/TestAssembly/TestAssembly.csproj b/TestAssembly/TestAssembly.csproj
index 253435e..7be1ca1 100644
--- a/TestAssembly/TestAssembly.csproj
+++ b/TestAssembly/TestAssembly.csproj
@@ -44,6 +44,12 @@
     <Compile Include="ClassWithPrivateDefaultCtor.cs" />
     <Compile Include="ClassWithProtectedDefaultCtor.cs" />
     <Compile Include="ClassWithPublicDefaultCtor.cs" />
+    <Compile Include="Collections\Branch.cs" />
+    <Compile Include="Collections\Forest.cs" />
+    <Compile Include="Collections\ICanAdd.cs" />
+    <Compile Include="Collections\ICanRemove.cs" />
+    <Compile Include="Collections\Leaf.cs" />
+    <Compile Include="Collections\Tree.cs" />
     <Compile Include="Dtos\AnotherClass.cs" />
     <Compile Include="Dtos\BlahDto.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
diff --git a/TestStack.ConventionTests.Tests/CsvReportTests.Can_run_convention_with_simple_reporter.approved.txt b/TestStack.ConventionTests.Tests/CsvReportTests.Can_run_convention_with_simple_reporter.approved.txt
new file mode 100644
index 0000000..07a98d3
--- /dev/null
+++ b/TestStack.ConventionTests.Tests/CsvReportTests.Can_run_convention_with_simple_reporter.approved.txt
@@ -0,0 +1,5 @@
+collection,item,can add,can remove
+TestAssembly.Collections.Branch,TestAssembly.Collections.Leaf,False,False
+TestAssembly.Collections.Forest,TestAssembly.Collections.Tree,True,True
+TestAssembly.Collections.Tree,TestAssembly.Collections.Branch,True,False
+TestAssembly.Collections.Tree,TestAssembly.Collections.Leaf,False,False
diff --git a/TestStack.ConventionTests.Tests/CsvReportTests.cs b/TestStack.ConventionTests.Tests/CsvReportTests.cs
new file mode 100644
index 0000000..1fbf327
--- /dev/null
+++ b/TestStack.ConventionTests.Tests/CsvReportTests.cs
@@ -0,0 +1,24 @@
+namespace TestStack.ConventionTests.Tests
+{
+    using System.Linq;
+    using ApprovalTests.Reporters;
+    using NUnit.Framework;
+    using TestAssembly.Collections;
+    using TestStack.ConventionTests.ConventionData;
+    using TestStack.ConventionTests.Tests.TestConventions;
+
+    [UseReporter(typeof(DiffReporter))]
+    public class CsvReportTests
+    {
+        [Test]
+        public void Can_run_convention_with_simple_reporter()
+        {
+            Convention.IsWithApprovedExeptions(new CollectionsRelationsConvention(), new Types
+            {
+                TypesToVerify =
+                    typeof (Leaf).Assembly.GetExportedTypes()
+                        .Where(t => t.Namespace == typeof (Leaf).Namespace).ToArray()
+            });
+        }
+    }
+}
\ No newline at end of file
diff --git a/TestStack.ConventionTests.Tests/TestConventions/CollectionsRelationsConvention.cs b/TestStack.ConventionTests.Tests/TestConventions/CollectionsRelationsConvention.cs
new file mode 100644
index 0000000..1e342a4
--- /dev/null
+++ b/TestStack.ConventionTests.Tests/TestConventions/CollectionsRelationsConvention.cs
@@ -0,0 +1,41 @@
+namespace TestStack.ConventionTests.Tests.TestConventions
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using TestAssembly.Collections;
+    using TestStack.ConventionTests.ConventionData;
+    using TestStack.ConventionTests.Internal;
+
+    public class CollectionsRelationsConvention : IConvention<Types>
+    {
+        public ConventionResult Execute(Types data)
+        {
+            var types = data.TypesToVerify;
+            var collectionToItemLookup = from collection in types
+                where collection.IsClass
+                orderby collection.FullName
+                from item in GetItemTypes(collection)
+                select new
+                {
+                    collection,
+                    item,
+                    can_add = typeof (ICanAdd<>).MakeGenericType(item).IsAssignableFrom(collection),
+                    can_remove = typeof (ICanRemove<>).MakeGenericType(item).IsAssignableFrom(collection)
+                };
+
+            // I feel so badass for using an anonymous type as generic parameter here :)
+            return ConventionResult.For(collectionToItemLookup, "well, does the header apply here all across the board? How would that work for CSV?");
+        }
+
+        IEnumerable<Type> GetItemTypes(Type type)
+        {
+            return from @interface in type.GetInterfaces()
+                where @interface.IsGenericType
+                where @interface.GetGenericTypeDefinition() == typeof (IEnumerable<>)
+                let item = @interface.GetGenericArguments().Single()
+                orderby item.FullName
+                select item;
+        }
+    }
+}
\ No newline at end of file
diff --git a/TestStack.ConventionTests.Tests/TestStack.ConventionTests.Tests.csproj b/TestStack.ConventionTests.Tests/TestStack.ConventionTests.Tests.csproj
index 5736818..43afb54 100644
--- a/TestStack.ConventionTests.Tests/TestStack.ConventionTests.Tests.csproj
+++ b/TestStack.ConventionTests.Tests/TestStack.ConventionTests.Tests.csproj
@@ -52,6 +52,7 @@
   </ItemGroup>
   <ItemGroup>
     <Compile Include="ConventionAssertionClassTests.cs" />
+    <Compile Include="CsvReportTests.cs" />
     <Compile Include="ProjectBasedConventions.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="Properties\Resources.Designer.cs">
@@ -59,6 +60,7 @@
       <DesignTime>True</DesignTime>
       <DependentUpon>Resources.resx</DependentUpon>
     </Compile>
+    <Compile Include="TestConventions\CollectionsRelationsConvention.cs" />
     <Compile Include="TypeBasedConventions.cs" />
   </ItemGroup>
   <ItemGroup>
diff --git a/TestStack.ConventionTests.Tests/TypeBasedConventions.cs b/TestStack.ConventionTests.Tests/TypeBasedConventions.cs
index 51f7df6..c65833c 100644
--- a/TestStack.ConventionTests.Tests/TypeBasedConventions.cs
+++ b/TestStack.ConventionTests.Tests/TypeBasedConventions.cs
@@ -1,5 +1,6 @@
 namespace TestStack.ConventionTests.Tests
 {
+    using System.Linq;
     using ApprovalTests;
     using ApprovalTests.Reporters;
     using NUnit.Framework;
@@ -16,7 +17,9 @@ public class TypeBasedConventions
 
         public TypeBasedConventions()
         {
-            var itemsToVerify = typeof (SampleDomainClass).Assembly.GetTypes();
+            var itemsToVerify = typeof (SampleDomainClass).Assembly.GetTypes()
+                .Where(t => t.IsClass && t.Namespace == typeof (SampleDomainClass).Namespace)
+                .ToArray();
             nhibernateEntities = new Types
             {
                 TypesToVerify = itemsToVerify
diff --git a/TestStack.ConventionTests/Convention.cs b/TestStack.ConventionTests/Convention.cs
index 0d60479..6489ec2 100644
--- a/TestStack.ConventionTests/Convention.cs
+++ b/TestStack.ConventionTests/Convention.cs
@@ -1,35 +1,50 @@
 namespace TestStack.ConventionTests
 {
+    using System;
     using System.Diagnostics;
     using ApprovalTests;
     using ApprovalTests.Core.Exceptions;
+    using TestStack.ConventionTests.Internal;
 
     public static class Convention
     {
         public static void Is<TData>(IConvention<TData> convention, TData data) where TData : IConventionData
         {
-            data.EnsureHasNonEmptySource();
-            var result = convention.Execute(data);
+            var result = Execute(convention, data);
 
             if (result.Failed)
                 throw new ConventionFailedException(result.Message);
         }
 
-        public static void IsWithApprovedExeptions<TData>(IConvention<TData> convention, TData data) where TData : IConventionData
+        static ConventionResult Execute<TData>(IConvention<TData> convention, TData data) where TData : IConventionData
         {
             data.EnsureHasNonEmptySource();
             var result = convention.Execute(data);
+            return result;
+        }
+
+        public static void IsWithApprovedExeptions<TData>(IConvention<TData> convention, TData data)
+            where TData : IConventionData
+        {
+            var result = Execute(convention, data);
 
             // should we encapsulate Approvals behind Settings?
             try
             {
                 Approvals.Verify(result.Message);
 
-                Trace.WriteLine(string.Format("{0} has approved exceptions:\r\n\r\n{1}", convention.GetType().Name, result.Message));
+                Trace.WriteLine(string.Format("{0} has approved exceptions:{2}{2}{1}",
+                    convention.GetType().Name,
+                    result.Message,
+                    Environment.NewLine));
             }
             catch (ApprovalException ex)
             {
-                throw new ConventionFailedException("Approved exceptions for convention differs\r\n\r\n"+ex.Message, ex);
+                throw new ConventionFailedException(
+                    "Approved exceptions for convention differs" +
+                    Environment.NewLine +
+                    Environment.NewLine +
+                    ex.Message, ex);
             }
         }
     }
diff --git a/TestStack.ConventionTests/Internal/ConventionResult.cs b/TestStack.ConventionTests/Internal/ConventionResult.cs
index 59e655c..5e38f57 100644
--- a/TestStack.ConventionTests/Internal/ConventionResult.cs
+++ b/TestStack.ConventionTests/Internal/ConventionResult.cs
@@ -1,8 +1,10 @@
 namespace TestStack.ConventionTests.Internal
 {
     using System;
+    using System.Collections;
     using System.Collections.Generic;
     using System.Linq;
+    using System.Reflection;
     using System.Text;
 
     public class ConventionResult
@@ -18,6 +20,26 @@ public bool Failed
             get { return !string.IsNullOrEmpty(Message); }
         }
 
+        public static ConventionResult For<TResult>(
+            IEnumerable<TResult> items,
+            string header)
+        {
+
+            var array = items.ToArray();
+            var result = new ConventionResult();
+            if (array.None())
+            {
+                return result;
+            }
+            // ROUGHSKETCH: We split the job between formatter and reporter. Formatter provides the data, reporter provides the structure
+            var formatter = new DefaultFormatter(typeof (TResult));
+            var reporter = new CsvReporter();
+            return new ConventionResult
+            {
+                Message = reporter.Build(array, header, formatter)
+            };
+        }
+
         public static ConventionResult For<TResult>(
             IEnumerable<TResult> items,
             string header,
@@ -74,7 +96,7 @@ public static ConventionResult ForSymmetric<TResult>(
                 if (firstArray.Any())
                 {
                     message.AppendLine();
-                    message.AppendLine();                    
+                    message.AppendLine();
                 }
                 message.AppendLine(secondHeader);
                 message.AppendLine(string.Empty.PadRight(secondHeader.Length, '-'));
@@ -92,8 +114,50 @@ public static ConventionResult ForSymmetric<TResult>(
         {
             return ForSymmetric(
                 firstHeader, firstResults, secondHeader,
-                secondResults, 
-                (item, message) => message.AppendLine(itemDescriptor(item)));            
+                secondResults,
+                (item, message) => message.AppendLine(itemDescriptor(item)));
+        }
+    }
+
+    public class CsvReporter
+    {
+        public string Build(IEnumerable results, string header, DefaultFormatter formatter)
+        {
+            var message = new StringBuilder();
+            message.AppendLine(string.Join(",", formatter.DesribeType()));
+            foreach (var result in results)
+            {
+                message.AppendLine(string.Join(",", formatter.DesribeItem(result)));
+            }
+            return message.ToString();
+        }
+    }
+
+    public class DefaultFormatter
+    {
+        readonly Type type;
+        readonly PropertyInfo[] properties;
+
+        public DefaultFormatter(Type type)
+        {
+            this.type = type;
+            properties = type.GetProperties();
+        }
+
+        // TODO: this is a very crappy name for a method
+        public string[] DesribeType()
+        {
+            return properties.Select(Describe).ToArray();
+        }
+
+        string Describe(PropertyInfo property)
+        {
+            return property.Name.Replace('_', ' ');
+        }
+
+        public string[] DesribeItem(object result)
+        {
+            return properties.Select(p => p.GetValue(result, null).ToString()).ToArray();
         }
     }
 }
\ No newline at end of file