Hi Charlie, 1. Will start with the scenarios outlined by you plus some of my own. Maybe they could feature in the help section. 2. Waiting for the merge to happen or can NUnit GUI work with Simone's commit? Because I also want to test the GCConcurrent (for previous .net versions) and serverGc (for .net 4.5) element and this can be done only through the App config file. I guess this is more important due to it being the new feature in .Net 4.5. 3. The unmanaged aspect to it, where the above configuration settings can be overridden by the requesting app.What happens in the test (this is not a question) when the config settings can be overridden by a call to IsServerGC call from the unmanaged app. Is this consideration important? And to complicate things further, some processor.architectures are not supported. I am not sure if this should be documented as a known issue in NUnit or should NUnit provide a hint when the Async tests are run or executed? 4. The SynchronizationContext and the AsynchronizationContext can be quite tricky when GcCocurrent and ServerGC elements can both be used. Please comment on this with reference to #2 above. Jv On Mon, Oct 1, 2012 at 3:37 AM, Charlie Poole