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A four-day week is an arrangement where a workplace or school has its employees or students work or attend school over the course of four days rather than the more customary five.  This arrangement can be a part of flexible working hours, and is sometimes used to cut costs.
In 2008, employees of the Utah state government all began working ten-hour days from Monday to Thursday. Utah ended this practice however, in 2011. By closing state government offices on Fridays, the state expected to save on operating costs such as electricity, heat, air conditioning, and gasoline for state-owned vehicles. Many local governments have had alternative schedules for many years. 
Public schools in Hawaii closed on 17 Fridays in 2010. Over 100 school districts in rural areas in the United States changed the school week to a four-day week; most also extended each school day by an hour or more. The changes were often made in order to save money on transportation, heating, and substitute teachers.
|This article needs additional citations for verification. (March 2011)|
- Rex L. Facer II and Lori L. Wadsworth. 2010. “Four-day Workweeks: Current Research and Practice” Connecticut Law Review 42, (4): 1031-1046.
- "Utah is going to a 4-day workweek". MSNBC. Associated Press. July 3, 2008.
- Lori L. Wadsworth, Rex L. Facer II, and Chyleen A. Arbon. 2010. “Alternative Work Schedules in Local Government: Qui Bono?” Review of Public Personnel Administration 30, (3): 322-340.
- Rex L. Facer II and Lori L. Wadsworth. 2008. “Alternative Work Schedules and Work Family Balance: A Research Note.” Review of Public Personnel Administration 28, (2): 166-177.
- Rex L. Facer II, Lori L. Wadsworth, and Chyleen Arbon. 2009. “Cities Leading the Way: The Use of Alternative Work Schedules by Cities. 2009 Municipal Yearbook. ICMA Press: Washington DC, pp. 28-33.
- "Schools' New Math: The Four-Day Week". The Wall Street Journal. March 8, 2010.
- Toppo, Greg (August 20, 2002). "In rural areas, the four-day school week is growing in popularity". The Christian Science Monitor. Associated Press.
- "Four-Day School Weeks". National Conference of State Legislatures. Retrieved February 3, 2011.
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