I would do what I did with our youngest, and I only recommend this with kids over three. We chose a date, a week or so out and told him that after that date there would be no more diaper. (never used pull ups). They must be out of the house completely. I bought two laundry baskets and a ton of fun themed underwear. I them gave all the control to him. He was quite smart and verbal and completely able to control the situation. Clean underwear in one basket, wet or dirty in the other and he had to change himself. I would remind him he might want to go, but no forces....his choice. About two days later, no wet underwear at all. A bit longer for poops and he wet the bed maybe once or twice ever after that day. He needed the control and giving it too him made it happen. Have shared this with others and it almost always works as long as the child is truly ready to train.