We've all had them -- and who hasn't hit a wall at some stage...
'tell us a time you...'.
Blank!
I've been in plenty of interviews where fabulous capable people have tanked answering these questions for a lack of preparation.
The behaviour-based question is assuming that your past behaviour is the best predictor of future behaviour.
These questions also give an indication of your personality, and what you'd be like to work with:
whether you share the glory with others; are able to reflect on your mistakes and see how a situation could have been handled differently; how coherent your thinking is (can you stick to the STAR formula when responding); and how well you deal with follow up questions.
HOW?
1. The respondent doesn't take a deep breath, and think for a moment to come up with the best scenario, before they launch into it. It's OK to say, 'Hmm, good question, let me think about that for a moment.'
2. The scenario is rehearsed and does not really answer the question at all.
3. The respondent starts answering the question and then realises they're not on the right track -- or they THINK they're not on the right track and starts to digress.
4. The answer is very detailed, making it long and tedious to listen to, demonstrating that the respondent does not get to the point or edit out irrelevant information when they're talking.
5. There's a certain amount of fiction in answer and it's glaringly obvious to the interviewers -- the language you use, probably subconsciously, tells a lot about how solid your response is. Using words like 'we' instead of 'I' can mean it wasn't really your project or decision you're talking about. Non committal words like 'maybe' 'kind of' 'perhaps' 'to some degree' also suggest the truth is buried somewhere in your answer. Be confident and precise.
6. If the interviewer asks a follow up question it's not because they're testing you -- you may have omitted some information that would help make the scenario make sense (remember, you know the situation best). Don't get defensive, often this is a space to close any gaps in the information you've just given, or an opportunity to put a positive spin on your response if you haven't already. The interviewer in most cases is trying to help, by leading you to the information they're after.
PREPARE!
You can prepare for these interview questions by looking at the selection criteria for the role you're going for, and then brainstorming some examples working through the STAR objectives.
Here's some useful
information on answering behavioural interview questions from the University of Sydney's careers website.
And, good luck!