Inclusion Criteria:  signed informed consent type 1 diabetes Age >6 years at least 10 IE daily total Insulin dose and 25 kg Body weight Group SWITCH: already user of t:slim X2 with Basal IQ Group START: Granting of the insulin pump t:slim X2 and DexCom G6 by the health insurance  Exclusion Criteria:  1.Refusal of participation by the participant or a parent