A governed AI deployment in thirteen fixed weeks, through four evidence-gated approvals. The window does not compress under deadline pressure, and it does not quietly extend.
Every phase exit is a documented go or no-go decision, supported by named evidence and a named owner. Never a subjective read of good enough.
The use case is selected and bounded, the rung confirmed, and the delivery team and Oversight Core named with their authority written down.
Controls are designed and implemented alongside the system rather than after it, so governance is the operating mode and not an audit layer bolted on.
The controls are tested against real failure, not described. The Value Realization Index records what the deployment actually returned.
A failed Tollgate moves the date, not the gate. Nothing in the methodology permits waiving a Tollgate, lowering its threshold, or substituting a lighter check to protect a deadline.
Published because scope creep is the failure mode this methodology exists to prevent, and procurement should see the limit before signature.
Clients who have completed a TAG assessment enter Phase 1 with their rung already confirmed. Everyone else starts with a four-question check.