Operational sequence
- Document how the source could know this exact information.
- Separate first-hand observation, hearsay, inference, translation, and copied reporting.
- Rate demonstrated source history without converting it into a permanent truth score.
- Rate the current information using specificity, timeliness, plausibility, and independent support.
- Revise either rating independently when new evidence appears.
Failure states
- Status-based credibility
- Diagnosis-based credibility
- Counting copied reports as corroboration
- Assuming a reliable source cannot be wrong