01 · Feasibility study. Before anything can be described, you need to know what is possible at all and what it costs. The study reviews the existing systems and data, sets out the solution options, and compares them on the same basis: order of magnitude of cost, risk, dependencies, schedule, and impact on what already exists.
02 · Terms of reference package. The description a bidder can price from and that you can later accept against. It covers scope, requirements, data flows and interfaces, non-functional requirements, acceptance criteria and assumptions. It also covers what is deliberately left out of the first stage, because leaving that unsaid is exactly what makes bids incomparable.
03 · Bid evaluation support. Drawing up the evaluation criteria before the tender is published, and comparing the substance of the bids once they arrive. The questions to put to a bidder, and notes on the places where a bid promises less than it appears to at first glance.
04 · Independent oversight during delivery. Once the contract is signed, the same person who wrote the description watches that what is built matches what was agreed. Review of interim deliverables, checking against the acceptance criteria, and a written opinion before every payment decision.
In that fourth step the independence is structural. Our deliverable is the description and the assessment, the build contract goes to a bidder, and so we have no interest in that procurement other than the client's own.