“Refers to employee’s freedom to vary hours from day-to-day and week-to-week, without prior approval from supervisor. The greater the variability and the less need for prior approval, of course, the greater a program’s flexibility” (Golembiewski & Proehl, 1978, p. 838).
Golembiewski, R.T., & Proehl, C.W. Jr. (1978). A survey on the empirical literature on Flexible workhours: Character and consequences of a major innovation. Academy of Management Review, 3(4), 837-853.