Daniela, It sounds like you are thinking about incentives to bring your graduates to your alumni website. It's important to think about what things you could include that would provide that "buy-in"? You might consider components that alumni are looking for like a Job Board, an Alumni Directory (to connect with old classmates), or other helpful information they might be interested in - Career Services, Loan Info, Continuing Education. You may also want to consider some things that would, literally, force them to your site like Transcript Request Forms or Grad Surveys. June