sparky:
To clarify...
A few jobs, the $$$ payments are controlled by the Architect of record, and contractual documents contain 'steps' that are required for 'progress payments'. The required documentation is contained on various AIA (Amperican Instutite of Architects) (I think I got that right) forms, which the contractor has to fill out and submit with supporting paper and an invoice.
Paper, paper, paper.....equals a payment.
The full details are rather boring, but IF its part of the 'job', it has to be followed.