"When I taught at elite private schools, where most students lived on campus or nearby, if I faced such a problem it was easy to locate a student (even if it meant knocking on their door at home) to seek an explanation and a solution to problems. This process could not happen at a commuter school where students often lived two or three hours away. Locating a student often took hours of time. And by the time a connection was made it was too late for grades reflecting excellence."