Work begins where the description stops being ambiguous. Contradictions between fields are surfaced instead of being averaged away. Each delivery says how old its parts are.
Sample review
A small extract produced and inspected against the brief before the full selection is run.
Delivery verification
A final pass against the agreed criteria at the point of handover, not at the point of assembly.
Change log
A note of what each processing stage altered, kept so the build can be retraced.
Put the deadline on the table early; it changes what is sensible.