It would probably benefit from a chronology that marks where between consoles a generation was defined. But on the otehr hand, there is some dispute as to whether the dreamcast is a next-gen or not. While it doesn't quite stand up to the gamecube or PS2, it is certainly a massive step up from playstation and N64.
--Alan D
Your quite right, the definition of bitness is completley arbituary even outside of the scope of VGS systems (does bitness mean register size, data bus, address bus what?). What else is there apart from Generation?
--Alex
That shapes up a lot better now. Now all we need is for some more knowledgeable people to add the more obscure consoles (Japan had loads IIRC, was Neo-Geo a home colse?).
I think that generations are sufficiently ill-defined that we might not want to use them. It's very odd to have a generation including the intellivision and its successor, isn't it?