Make uncertainty visible without inventing a price
An invented project estimate assumes one source export, two user roles and customer-supplied bilingual copy. No labour rate, price or promised completion date is supplied.
| Assumption | Evidence/status | Owner | Re-estimate when |
|---|---|---|---|
| One CSV source with stable IDs | Sample received; full export not checked | Data owner | A second source or conflicting IDs appear |
| Two roles: staff and admin | Role list approved in fixture | Business owner | A third role needs different permissions |
| Customer supplies reviewed EN/zh-HK copy | Drafts only; approval pending | Content owner | Translation or repeated rewrites enter supplier scope |
A changed assumption needs an impact review
A second source file is discovered. Does this sheet tell you how many extra days to add?
Show the worked answer
No. It identifies the broken assumption and relevant owner. Inspect overlap, formats and work before revising the estimate; do not automatically double time or price.
The sheet records estimate conditions, not a quotation or guaranteed timeline. Keep original and revised assumptions alongside any real proposal.