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Scope gaps do not announce themselves. They turn up as a change order months later, when the only question left is who pays.
Those are three different problems and they get confused constantly. Missing means nobody wrote it down. Undecided means it was raised and never settled. Excluded means a trade explicitly refused it. The review separates them, because each one needs a different person to do something about it.
Firestopping, sleeves and hoisting are the classic examples: everyone assumes another trade has them, and no subcontract says so. Those get flagged specifically rather than being left to be discovered on site.
A responsibility that appears in one trade's scope and nowhere else looks settled when you read that contract alone. Mapping boundaries across trades is what makes the one-sided ones visible.
When it drafts a scope exhibit, every open decision is marked for a person to answer. It does not quietly pick an answer to produce a document that looks finished.
Questions
A 32 trade checklist, reporting what is missing, undecided or excluded as three separate categories rather than one list of problems.