Which procedures? The lists of procedures acceptable for day surgery is constrained only by the need for an uncomplicated postoperative course. In recent years technological advances have revolutionized the number of operations permissible, and will continue to do so. Thus, anecdotal reports of thyroidectomies, vaginal hysterectomies, ectopic pregnancies, and cholecystectomies have been published I as the essential requirements of minimal physiological disturbance, little risk of haemorrhage, and postoperative pain controllable by oral analgesics, are more easily satisfied. There remain several controversial surgical procedures, such as tonsillectomy in children or angioplasty in adults. While series of successful ambulatory management have been published it is more usual to consider such candidates for "short-stay" (8-24 hr) admissions for observation. Sepsis is also considered a relative complication, for the need for postoperative antibiotic coverage may not be met by non-intravenous techniques.