How many examples to prepare

I recommend that you prepare two examples per competency. I sometimes see that advice included in competition booklets and agree with it.

Why more than one? Because in the interviews I chair, it is rare for us to ask only one question per competency. And the candidates who do the best at interview, use different examples.
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Or an interviewer might ask for another example other than the one you have included on the form or the one you have prepared.