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Hi! Are you referring to the civil service interview or interviews in general? Because if you refer to the civil service, then strenght interviews would be questions that focus on your interpersonal abilities that you use all the time which make you the best person for the job, however in general, strenght questions would be something that show whether you are a fit for that place or not and they usually throw you off a bit, i.e. 'do you prefer planning in advance or do you thrive when preparing last minute?' or 'do you prefer collaborating or working alone?' or even 'How do you stay motivated?'; while competency based questions focus on your technical abilities and experience and you can usually prepare for them, such as: 'why are you applying for this role?' 'why this firm?' etc.
