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STAR stands for:
Situation - provide some brief details about the situation you were in when you used a competency so that the reader can understand the context of the example.
Task - outline what your objective or purpose was during that situation, again to put your answer into context.
Action - describe what you did in that situation and how you approached it.
Result - state the outcome, for example: Were the objectives met? What did you learn/gain from being in that situation?