Before interviewing, reflect on your personal strengths and make a list of them ("natural number sense," "able to multitask," "good with people," "able to teach others"). Then tie each of these strengths to a professional accomplishment. Answer with the strength you feel best fits the position being discussed, and be sure to offer the anecdote that goes with it. Conclude your response by asking the interviewer if this is the kind of quality that would help his or her company.