1. When children don't abide by the agreement, they should also learn to bear the consequences of their actions. Just like Adi in Butch's book, he felt the crisis of friendship because he didn't keep the agreement with his friends, and realized that only by keeping the agreement can he have a happy partnership, thus cherishing the importance of the agreement more.

2. Make simple and easy promises. No matter to others or to yourself, don't make too many promises at once, and don't make promises that are difficult to complete. Otherwise, it's just a blank check, which means nothing.

3. Parents themselves "show the law". The law here is not a law, but a way to keep promises. Sometimes it's not that children don't want to do it, but that children don't.