It's worth noting that other people, both from the classical and nouvelle AI sides, are beginning to realise that AI should try building integrated systems. For another example of one, see the simulated submarine described by Vere in A Basic Agent, AI photocopy V15, and once dubbed ``the most complete artificial intelligence built to date''. It's also described in a recent AI article, Silicon Babies in Scientific American, December 1991. Unlike Soar, this only satisfies the first two meanings: it doesn't have a single underlying mechanism.