We use a very visual, concrete behavior chart. Something like 3 strikes and he loses whatever - you make a large chart with 3 boxes (you may need to start with more), each time he crosses the line he gets an X. When it gets full, then he loses whatever privilege (screen time, favorite toy, etc.). You could also do a good behavior chart, where you make a large chart with 5 boxes, or 10, and when he's being good you put a check mark in the box. When he gets so many checks, there is a picture of his "reward" on it (fave video, special snack, etc.)
The more visual you can make his discipline, the more effective it will be.
at 1:20 PM on Feb. 3, 2011