This is a report of the total Australian experience in coronary artery bypass graft surgery over a two year period from October 1, 1974, to September 30, 1976. It provides data on the results up to discharge from hospital. There were 2349 patients undergoing operation in 9 units in all mainland States. Each of the nine participating units reported preoperative data on age, sex, symptoms, previous history, indications for surgery and special investigations including results of X-ray examination, electrocardiography (ECG), ventricular and coronary angiograms and left ventricular end diastolic pressure as well as details of surgery which was carried out, and patient status at the time of discharge. The data were collated and analysed at National Heart Foundation headquarters in Canberra.