Ha...what did I write? Okay, "venn diagram"...but you know what I mean...lots of ways to organize/visualize relationships or info. Hmmm, other reasons that such a master compatibility chart hasn't emerged are likely: 1) the various workarounds available (V3 UV Mayadoll, those V3head/V2body hybrid figures, P4V2, etc.) which sort of obviate or further confuse the matter, and 2) such a list might quickly become outdated. You'd think DAZ would maintain one for their products...maybe in their FAQs section.