Effective February 20, 2009, California's alternative workweek rules have been amended to give employers more flexibility in setting up alternative workweek schedules ("AWS"). The new rules broadly define the "work unit" for purposes of an AWS to include not only an entire division or department, but also a job classification, a shift, a separate physical location, or a recognized subdivision. The law also states that a single employee under certain circumstances may comprise a "work unit." In addition, the new law clarifies that employers may give employees an option to work the AWS or a regular 8-hour shift, and can also permit employees to switch between an AWS (e.g., four 10-hour days) and a regular schedule (e.g., five 8-hour days) on a weekly basis.