My 3yo DS runs off frequently when we are out. He knows the number 1 rule in our family is don't run away and can recite the number 1 rule whenever asked but he seems to take absolutely no notice of it. I try and set very reasonable boundaries when we are out eg stay within sight of me (in parks etc)and he is generally pretty good but sometimes he just seems to completely forget. I am at my wits end and really worried that something will happen. We had a big scare in a shopping centre recently, he was right behind me in an open area coffee shop playing with some toys and then he just disappeared. He also got scared but a few days later he ran off again. A friend suggested using a book about a child running away as a guide for discussion and consequences. Does anyone know of any book that would be useful? Does anyone have any other useful advice please?