When answering this question you also have the opportunity to briefly touch on a previous area/question that you may have felt you didn't answer too well - however you have to be brief, no detract in any way shape or form from the original question and ensure you don't give the impression that you are laboring any particular point or trying to get one up on the interviewer. For example if you where previously asked about stakeholder management and you didn't feel that you gave a full and impressive answer - then touch on your experience on stakeholder management while speaking about a project you have worked on.