Quick answer
An assumptions log lists what we treat as true without proof — each with validation owner and date; every failed assumption is a risk the log names early.
The fields
Assumption, why believed, validation method, owner, check date, status — the log is short, pointed, checked.
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Assumption vs risk
An assumption is treated as true; a risk is treated as uncertain — failed assumptions convert to risks.
Examples
‘API documented’, ‘vendor delivers by May’, ‘team stays stable’ — write them so they can be checked.
Maintenance
Reviewed with the risk register — an unchecked log is false confidence in writing.
Bottom line
An assumptions log lists what we treat as true without proof — each with validation owner and date; every failed assumption is a risk the log names early.
FAQ
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