Abstract
A study of fatigue in civil aircrew is briefly described and a view of fatigue as a generalized response to stress is developed from the results. The factors associated with a fatigue reaction in aircrew are identified, and it is pointed out that they derive directly from technological advances in the airline industry. Similar advances in other branches of industry may be expected to bring similar problems, notably a progressively wider adoption of shift working. Solutions may be achieved by the application of human factors principles to the full range of human factors problems in industry, and by the determination of appropriate work-rest cycles for various kinds of work.