“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.