Effects of the 4-day, 40-hour workweek were examined in the present field study by comparing two experimental groups (« = 97. n = 111) and a comparison group (n = 94) of operating employees in a medium-sized manufacturing company. Comparisons were made on dimensions of self-actualization, autonomy, personal worth, social affiliation, job security, pay and overall job satisfaction, anxiety-stress, absenteeism, and performance over a 13-month and a 25-month period. The analysis of 13-month data indicated that the workers in the 4-day, 40-hour groups were (a) more satisfied with autonomy, personal worth, job security, and pay; (b) experienced less anxiety-stress; and (c) performed better with regard to productivity than did the comparison group. However, these improvements were not found with the 25-month data.Interest in the revised workweek in the United States is part of the general trend among most industrialized nations to reexamine worktime patterns. The spread of adoption of the shortened workweek has aroused considerable interest because of the potential effects of the revised work schedule on job satisfaction and performance.A growing number of firms have been willing to experiment with 4-day schedules. Wheeler (Note 1) estimates that at least 2,000 companies have adopted the 4-day schedule for operating employees. A majority of the literature in the past decade concerning the 4-day, 4-0-hour workweek is based either on authoritative opinions or on survey data (Glickman & Brown, 1974). This literature suggests that despite some inherent difficulties, the 4-40 (4-day/40-hour) workweek is being adopted because it is expected to result in improved morale (Steele & Poor, 1970), better performance (Wheeler, Note 1), reduced absenteeism (Steward & Larsen, 1971), and the convenience that an extra day off provides for personal matters such as shopping and recreation (Poor, 1970).Despite the testimonial claims made by 4-40 workweek advocates, there have been someRequests for reprints should be sent to