The model
Instead of only asking how the deal succeeds, ask what conditions would make the promise fail economically or operationally.
Apply it
What would make the implementation late? What would make the SLA expensive? What would make the custom scope exceed budget? What would make collection slip?
Turn failure modes into evidence
For each material failure mode, identify the assumption or dependency that would prevent it. If the dependency is unproven, you have found an evidence gap.
Use it constructively
Inversion should create mitigation and repair, not pessimism. The goal is to remove avoidable failure modes while preserving the customer outcome.
