"EVANSTON, Ill. If any of the 70 undergraduates in Prof. Bill White's Organizational Behavior course here at Northwestern University are late for class, or not paying attention, he will know without having to scan the lecture hall.
"Their clickers will tell him.
"Every student in Mr. White's class has been assigned a palm-size, wireless device that looks like a TV remote but has a far less entertaining purpose. With their clickers in hand, the students in Mr. White's class automatically clock in as present as they walk into class."