Make investment recommendations

I need to send my investment recommendation memo to Miguel in Corporate Strategy and then to Tanya in Treasury for approval, signers in that order, with a decision by next Friday. Before that, confirm the supporting cash-flow table matches the forecast model and that the IRR, payback and sensitivity tabs are intact.

Before I send this to Miguel in Corporate Strategy, make the recommendation easy to act on: put the headline expected return and required capital on the first page, surface the worst-case cash-flow number, tag the assumptions that would make Tanya refuse funding, and make the sensitivity chart clickable so a reviewer can find it instantly.

The forecast model produced an IRR three percentage points higher after I consolidated the June entries; Miguel needs a clean yes/no by Friday and Tanya will kill it if the cash cushion under worst-case is below eight months. I don't know if the change came from a hidden formula or an input error. What’s the most likely source and the fastest way to prove it before I circulate?

Over the last six recommendations I keep finding last-minute breaks in linking and wrong assumptions that cost me nights before sign-off. I lose credibility and delay approvals. What one habit should I adopt to stop these recurring model-logic and linking errors?