Can you expand more on what you mean by organizing structure?

Daniel Vainsencher wrote:
> I think the need you're addressing could be better met with some
> organizing structure on top of TestCases... and that would be useful. I
> remember the mess it was to find a few score of RB TestCases not
> working, and then finding out that they are actually in implicit layers
> - the parser should be fixed before the refactorings, and so forth.
> Would have been nice if the layers were explicit.
> 
> Daniel