# First-fault review worksheet

Reliabotix | https://reliabotix.com/guides/first-fault-analysis
Generic blank worksheet. Not a recovery procedure. Use only permitted records.

## Incident and evidence boundary
- Incident reference:
- Asset reference (use site-approved identifiers):
- Reviewer and review time:
- Incident window and last-good observation:
- Original evidence files and row/event references:
- Source clocks, time zones, resolution, and known alignment limits:
- Collection gaps, quality issues, and omitted sources:

## Sequence
| Source time | Receipt time | Source and record reference | Reported change | Quality | Timing uncertainty |
| --- | --- | --- | --- | --- | --- |
| | | | | | |

Preserve raw evidence. Do not infer healthy states from missing events.

## Hypothesis and cascade
- First-fault candidate (or INSUFFICIENT EVIDENCE):
- Evidence supporting its position in the sequence:
- Proposed downstream symptoms and their evidence references:
- Approved logic/reference supporting each dependency:
- Alternative initiating events:
- Next approved read-only check:
- Evidence or observation that would falsify the candidate:
- Confidence and limitations:

## Reviewed outcome
- Cause status: UNCONFIRMED / CONFIRMED
- Confirmed cause and supporting evidence, if available:
- Restoration status: UNKNOWN / NOT RESTORED / RESTORED
- Verification record and qualified reviewer:
- Link to prior incidents on the same asset:

A candidate is not a verified physical cause. A reset is not proof of a repair.
Follow approved site procedures; never use this worksheet to bypass safeguards.