“Rotating schedules are normally composed of ‘fixed length’ schedules with varying start times. There are two types of rotating schedules, forward rotating and backward rotating” (Oexman, Knotts, & Koch, 2002, p. 152).
Schedules change periodically from days to evenings or nights” (Presser, 2003, p. 416).

Oexman, R.D., Knotts, T.L., & Koch, J. (2002, December). Working while the world sleeps: A consideration of sleep and shift work design. Employee Responsibilities and Rights Journal, 14(4), 145 - 157. Presser, H.B. (2003, November). Race-ethnic and gender differences in nonstandard work shifts. Work and Occupations, 30(4), 412 - 439.