In addition, many academics estimate that the half-life of engineering knowledge is between two to seven years, Jamieson said. “I can tell you for us at the universities, if it’s less than five or certainly less than four [years] we’re going to get scared because it means students come in as freshmen and by the time they are done, half of what we’ve done for those first couple of years may or may not be relevant?” she said. “It’s a frightening thought, and so it means we have to keep asking ourselves, what are the parts that stay relevant, so that in fact the education is current after the students graduate or at least current on the day they do graduate.”