I think animal trainers use positive feedback as it is more effective. This is what I (try) to do w/ my own kids. Praise the good and ignore the bad (unless it's really bad).
Praise the good and coach the bad is my approach. After DD is ready to talk about the behavior in a calm, rational manner, we discuss alternative ways she could have handled herself to achieve her goals without falling afoul of the rules.
As far as sticker charts go, DD has been told that, unless there's a phone call home, DW and I don't care about her behavior in school, that's between her and her teachers.
