This study is to compare metabolic control, treatment satisfaction, and quality of life during continuous subcutaneous insulin infusion (CSII ) therapy with a new insulin pump system with multiple daily injections (MDI) therapy. Furthermore, this study will add clinical data originating from clinical investigation in a special population, i.e. children and adolescents of ages 2 - 17 years , to the existing clinical data of the ACCU-CHEK Insight insulin pump.