Implications of innovative experiments with changes in the standard 40-hour workweek are dealt with in the study, which is a shorter version of a comprehensive report on changing work schedules prepared by the American Institute for Research. Varying patterns of two general types of workweeks are presented: (1) the compact workweek which may be compressed, for example, into four 10-hour days; and (2) the flexible workweek in which the employee has latitude in scheduling work time to meet the standard weekly requirement. Information is given about various administrative experiments in work scheduling. Given primary attention are the various kinds and degrees of impact that alternative schedules of work can have on human performance, social processes and organization, and the quality of life. Such alternatives may require that social-political systems develop means for greater control of free-time activities to ensure equity. Particular attention is given to the social and psychological adjustments required as a result of the trend discerned by the researchers, who offer guidance to those involved in anticipating and preparing for the foreseen changes. (Author/AJ)