Blameless post-mortem
Incident review where focus is on the system and the processes, not on who "pushed the wrong button".
Popularised by John Allspaw (Etsy) around 2012 and Google's SRE book (2016). The premise: people did what looked rational with the information they had. Blame prevents transparent reporting ⇒ the same failures recur. The structure: timeline, contributing factors, "what went well", action items (specific, owned, deadlined). Tools: PagerDuty Postmortems, Jeli (now PagerDuty), Howie. Paired with concepts like error budget and SLO.