Activities carried out by the American College of Radiology were described. Guidelines on radiographic techniques for radiological technicians were developed. Annual training sessions for technologists and physicians were conducted by the American College of Radiology Task Force on Pneumoconiosis. Regulations for performing chest X-rays were reviewed. Program activities such as the 12 point International Labor Organization (ILO) classification scale for diagnosis of coal workers' pneumoconiosis, and the reporting form for use of the 1980 ILO classification system were reviewed. The American College of Radiology maintained liaison between NIOSH and other medical specialty societies such as the American College of Chest Physicians, the College of American Pathologists, the American Medical Association, and the American Osteopathic College of Radiology. The American College of Radiology assisted NIOSH with the initiation, development, and maintenance of a quality control method to monitor and advise physicians on the reading of radiographs.