Wow, Peter, I don't think JJ B deserved the intensity, you do make some valid points however.

JJ B, It is possible for a data base to fall out of a prototype, but that has not been my experience.

I think this discussion started with the premise that "we have the requirements, should we develop the app or the data base first", at least that is the way interpretted it. I do not think many successful company's develop apps or data bases and then say "hey!, let us go see who wants/needs/can use this".