With this question the interviewer will be looking for confidence and clear communication in your answer. Remain composed, concise and precise in your answer, and demonstrate your ability to digest information. Your example could be anything, for instance, one candidate used the example of showing a foreign language student how to use an oyster card. They broke it down into each stage fully explaining not only how but why each action needed to be carried out. The interviewer will be looking for someone that can digest a process in this way, as well as someone who is very patient and adaptable in their method of communication.