The interviewer wants to learn more about your background by understanding your level of achievement in your career thus far. You most likely know your three greatest accomplishments, and if you are struggling to think through them, don't fret! Think about the times when you were given extra kudos in the workplace or when you received a special award. These make great examples too! Start off by giving the interviewer a 15-20 second overview of each accomplishment including how you achieved it and why it was important to you. Be sure to mention when the accomplishment was achieved and why it still stands out in your mind as one of your greatest accomplishments.