Time out's don't always work for kids either. Find what they love (a toy, an activity, a book etc) and use that. For example, my previous handful was only allowed to sit on a pink chair at afternoon snack if she had a good day. For morning snack and lunch she had to sit on a green chair. I couldn't believe how quickly the "bad" behaviour stopped after I stopped doing time outs and enforced this rule. She would sometimes spend most of her day in time out and the behaviour never changed!!