This is one of my favourite questions (it's based on a question my National Professional Qualification for Headship (NPQH) coach used to ask me) because it gets candidates to think about their contribution to the school organisation and their team spirit. If I'm interviewing for a senior leader I would follow this up with: what would you want them to say about you in three years time? This way I can get a sense of where they want to develop as leaders.