<qa>  What is the primary objective of the CBT program?Diabetes mellitus in children and adolescents is a source of stress and poor quality of life for themselves and their family. Development of adaptive coping strategies may be improved by focused parent and children training. This study assesses a cognitive behavioral treatment CBT for childrenadolescents with diabetes and their parents in comparison with standard health educational interventions. The investigators main aim is to verify that the CBT program improves overall balance of glycaemia better than phone contact without CBT content control group. Secondary objectives are expected improvements of health-related quality of life and coping styles in parents and children. 