Cheney & Bush didn't have much luck with it at GITMO, but they both continue to swear by it. My parents, teachers, coaches and employers used it on me in real-world experiments for years - rewards, punishment, lecture training, yelling, threatening, coercion.
The only thing that ever actually worked for me was observing for myself what others did that was successful, then imitating those behaviors as best I could. If I failed to do it correctly, I could tell because the Behavior Modification Training would begin again immediately.
Trial and error was the only way I ever learned anything regarding social functioning.
The few things I learned by being taught were: "Look at me when I'm talking to you" and "When you shake a man's hand, don't hand him a dead fish"