STAR is a useful skeleton that becomes obvious when you let it show.
The proportions that work
- Situation and task: 20% — just enough context
- Action: 60% — what *you* did, not what the team did
- Result: 20% — with a number, and what you learned
Where people go wrong
Long scene-setting. The interviewer does not need the org chart. Two sentences of context, then get to what you did.
Say "I", not "we"
Behavioural questions assess you. "We migrated the system" tells them nothing about your part. "I owned the data mapping and wrote the rollback plan" does.
Common questions
Do interviewers know I am using STAR?
Often, and that is fine. The structure helps them follow you. Just do not announce it.
What if the result was bad?
Use it. A clear-eyed account of a poor outcome and what changed afterwards scores well on the failure question.