The frequency of chronic renal insufficiency in children and adolescents up to the age of 17 was found by an inquiry addressed to 6625 doctors practising in Bavaria. The survey extended over an observation period of 5 years (1969-1974). According to the results, the frequency of chronic renal insufficiency in the age groups stated was calculated to be 8.7 per million inhabitants. An incidence of 0.83 per million inhabitants per year is to be expected for terminal renal insufficiency. From these figures the annual admissions for dialysis of patients aged between 0 and 17 years in Bavaria can be calculated at 9-13. To cater for these children with terminal renal insufficiency, the capacity must be increased from the present 10 to about 30 dialysis places in the next 5 years.