K.F., Oakland, California
RAT AWAY and right away, not to teach the guy a lesson but to give your professor an honest account of how the project was accomplished. It's misleading to include this student among those who did the work if he didn't.
Actually, you should have spoken to your teacher when the problem emerged. I consulted a business school professor who said, "The ground rules for dealing with free riders are sometimes explicitly laid outfor example, the free rider may be fired by an appropriate majority or supermajority of group members."
Keep in mind, too, that managers in the real world must sometimes cope with teams comprising both workers and drones. The professor I spoke to said, "One of the explicit benefits of working in groups is that it forces students to confront these and other management issues."
UPDATE: K.F. didn't tell the professor, deciding that his teammate had not harmed anyone enough to warrant it.
(The New York Times Upfront, Vol. 143, March 14, 2011)