Behavioral & Communication · intro
Failure & Learning
Owning mistakes, post-mortem.
Mental model
A real failure cost something you cannot get back. A useful failure story names exactly what you got wrong, what you tried next, and what concretely changed in your behavior since. "I learned a lot" is not a lesson.
How to study Failure & Learning
Begin by restating the mental model in your own words, then connect it to a concrete system you have built or operated. Name the mechanism, the constraint it addresses, and the trade-off it introduces. Use STAR interview method (Wikipedia), Google SRE Book — Ch. 15: Postmortem Culture: Learning from Failure, Etsy — Debriefing Facilitation Guide (Allspaw et al.) to check details, but close the source before writing your explanation. Retrieval is the learning step; rereading is only preparation.
Next, compare Failure & Learning with the neighboring concepts in its roadmap. Ask what changes in correctness, latency, resource use, operability, and failure recovery. Complete STAR: a real failure and preserve the command, input, output, and one failed attempt as evidence. Finish by explaining the idea without jargon to someone who has not studied the track.
Proof of understanding
- Explain the mechanism from first principles and identify the state it reads or changes.
- Give one situation where the concept is the right choice and one where it is not.
- Predict a realistic failure mode before running the drill, then compare the prediction with evidence.
- Connect the result to a roadmap or build artifact instead of treating the concept as isolated trivia.
Learn from primary sources
Practice and explain it back
STAR: a real failure
Write a STAR about a project that failed. Be specific about what you got wrong. End with what concretely changed in your behavior since.
Expected evidence: starStory() returns { situation, task, action, result, metric: { name, unit, before, after }, behaviorChange (what concretely changed since) }. The checker enforces structure only: four distinct sections of 20+ words, action the longest, 150+ words total, before ≠ after, and the result section must name the metric and state its after value. Aim for 250-350 words — that is the interview bar, not the checker’s.
Open the interactive drill →Review prompts
- What makes a post-mortem blameless in practice rather than just in name?
Build evidence
Use a roadmap capstone to turn this concept into working evidence.
Prerequisites
None assigned yet.
Related concepts
None assigned yet.