Step 9 · Root-cause method
Root-cause analysis
Expert mode offers any of the RCA methods. Remember the separation the pack requires: the mechanism is what physically happened; the root cause is the correctable reason those conditions existed or were not controlled.
Cause-and-effect (Fishbone / Ishikawa)
5 Whys
Change / Difference Analysis
Events & Causal Factors (timeline)
Barrier Analysis
FMEA / FMECA
Fault Tree Analysis
Events & Causal Factors (timeline)
Reconstruct the chronological sequence of events and conditions leading to the focus event, then identify causal factors. Use active verbs for events; link each to evidence.