punishment for cheating

Indonesia
October 26, 2009 11:03am CST
some of my students do cheating. they copy their friend's homework, they look at their friends' answers while they're doing exercise, and they cheat when they're doing their exams. I know it is about self confidence. they don't have enough self confidence to do all the tasks by themselves. what I want to do is make them get their self confidence. so, what are the appropriate punishments for this case?