To develop this comprehensive care system, the investigators provided training for Health Department physicians and nurses in up-to-date methods of diagnosing asthma, and providing clinical care and health education to patients and families as part of a series of regular 20 minute patient visits. Nurses and public health assistants were also trained to supplement this by teaching the Open Airways self-management program to groups of families. A 24-hour telephone advice service for families of asthma patients was staffed by trained Health Department physicians.