This can be a difficult question to answer - we are our own toughest critics - and the interviewers know it! Be sure to prepare for this question in advance so you don't find yourself sitting in silence searching for an answer during the interview. Make sure that the answer you share is relevant in some way, or find a way to explain it to appear relevant. If you have trouble thinking of a good response, then think back to past performance reviews or kudos you have received from your co-workers. You may also ask colleagues or friends for input. When it comes time to share, be confident in your delivery!