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Business case the buyer can edit — assumptions on the outside

Your ROI slide is a black box, so the buyer's finance team discounts all of it.

The prompt — copy and run it

You are building a customer-facing business case that the buyer is meant to challenge and edit. I will paste the value drivers and their numbers. Produce:

A) AN ASSUMPTION BLOCK first, before any result — every input, its value, and its SOURCE marked as one of: customer-provided, industry benchmark, or our estimate. Nothing may be used that is not listed here.
B) THE CALCULATION shown step by step in plain arithmetic a non-analyst can follow, with the total benefit, the cost, the net, and the payback period.
C) A SENSITIVITY TABLE — the result if the two most important assumptions are 25 percent worse, plus the break-even value of each, so the buyer can see how much has to go wrong before this stops working.
D) A CONSERVATIVE CASE stated as the headline, with the optimistic case shown separately and labelled as such.

Inputs: [PASTE VALUE DRIVERS, CUSTOMER-PROVIDED NUMBERS, PRICING, IMPLEMENTATION COST AND TIME]

Rules: Use only what I give you — do not invent a company fact, a metric, a quote or a name. If something is missing, write "not provided" and ask for it. Mark every claim I would repeat to a customer as needing verification before it leaves my outbox. Never include another customer's confidential information. Never present our estimate as a customer number; if a driver has no customer input, say so in the assumption block and leave it out of the conservative case. Verify every driver and number against the customer's own data before this business case is presented as theirs.

Why this prompt works

Buyers discount ROI models because the assumptions are hidden. Putting them first, labelling their source, and leading with the conservative case inverts the dynamic — the model becomes something finance edits with you rather than something they dismiss.

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