“An employee agrees to work an annual number of hours, typically at less than full-time. However, the hours are scheduled throughout the year in such a way that some weeks might require 45 or more hours, whereas other weeks would require substantially fewer hours.” (Barnett).
“Involves an employee working out an annual agreement for the number of hours worked, typically at less than full-time basis.” (Christensen & Staines, 1990).

Barnett, R. (2003, January 28). Reduced Hours Work/Part-time Work, A Sloan Work and Family Encyclopedia Entry. Chestnut Hill, MA: Boston College. Christensen, K. E., & Staines, G. L. (1990). Flextime: A viable solution to work/family conflict? Journal of Family Issues, 11(4), 455-476.