Abbreviations: DCCT, Diabetes Control and Complications Trial; GOLD, glycaemic control and optimisation of life quality in type 1 diabetes; DIAMOND, multiple daily injections and continuous glucose monitoring in diabetes; SWITCH, sensing with insulin pump therapy to control HbA 1c ; JDRF, Juvenile Diabetes Research Foundation; CITY, CGM intervention in teens and young adults with type 1 diabetes; WISDM, wireless innovation for seniors with diabetes mellitus; HypoDE, real-time continuous glucose monitoring in patients with type 1 diabetes at high risk for low glucose values using multiple daily injections in Germany; IN CONTROL, continuous glucose monitoring for patients with type 1 diabetes and impaired awareness of hypoglycaemia; IMPACT, novel glucose-sending technology and hypoglycaemia in type 1 diabetes; SELFY, FreeStyle libre glucose monitoring system paediatric study; REPLACE, an evaluation of a novel glucose sensing technology in type 2 diabetes; GP-OSMOTIC, general practice optimising structured monitoring to improve clinical outcomes in type 2 diabetes.