I've always been unsure where this stuff fits in. Do you make it before your system is built, when its unclear how where all the cards will fall? Or after your system is made and in production and all the warts of reality are present and your graph is not so nice and neat anymore. This seems like an architects picture of things. Close enough to give people the false confidence to think they understand things, but not close enough to be of use to anyone actually working in the salt mines.