:OK, I've just added a fair bit of work on what the waterfall method actually is, and arguments for it, including a supporting quote for BDUF from someone who gets a fair bit of respect in software circles (as far as I can see).  I feel that both views on the waterfall models usefulness are now included, and that neither argument can be removed in the interests of NPoV.  Maybe some clarification of points.  As per Wikipedia:POV_check ("may be removed by anyone if they feel that the issue has been resolved") I'm going to delete the "PoV check" template.  Feel free to argue here or replace it with a "NPoV" template if you feel that this was bad.