- Analysis: Concept of Operations, detailed requirements and acceptance test plans are generated.
- Design: Design documents and a minimum viable product that implements basic functionality is produced.
- Production: The end product covering all requirements is tested according to the acceptance test plan.
Note that for phases 1 and 2, there are no acceptance criteria for the deliverables, because adding additional criteria will drive the cost up. The contractor could submit a one page document and call it "requirements". The only leverage the customer has during these phases is the threat of not awarding the next phase and blacklisting. Therefore, most of the payment should be done in phase 3. If the total cost of the project is 100%, phase 1 should be 10%, phase 2 should be 20% and phase 3 should be 70%. Due to the relatively low cost, phases 1 and 2 could be awarded to multiple contractors to have some kind of competition.
Dividing the work into three phases protects the customer from mediocre contractors. At the end of phase 1 or phase 2, if the customer is not satisfied, armed with lessons learned and documents / prototype at hand, it can select another contractor. This phase structure also protects the contractor from fuzzy requirements and challenges that turn out to be technically impossible.
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