Evidence-based Methods
Opinion is cheap. The records are not. We prefer the pack the organization already uses: the board book, the operating review, vendor scorecards, the last audit, the capital paper that was approved and then quietly revised.
Where we estimate, we label the estimate. A round number with no source is not analysis. A precise number with a source the client cannot find is worse, because it looks like certainty.
Methods stay light on purpose. The test of a finding is whether the people who run the work recognize it, and whether they can repeat the review after we leave.