Attention Deficit/Hyperactivity is a widespread disorder among school population (about 5%) and it's a problem for teachers and for parents who often have a lack of abilities for managing these kids. In this paper we present a metacognitive training done with 15 ADHD children of primary school from Ferrara and from Venice's provence. The results of the experimental group are compared with data of a control group of 11 children who did an aspecific training.