Excerpt from the Education Week article by Marva Hinton:
There is no conclusive evidence that four-day school weeks save districts money, according to a study by the Oklahoma Department of Education.
The department analyzed expenditures for 16 school districts in the state that started four-day school weeks during the 2011-2012 school year. The study looked at each district's expenditures from fiscal year 2008-2009 through 2015-2016 in four different areas: utilities, food, transportation, and support staff.
The analysis found that nine of the 16 districts spent more money on average following the change to a four-day school week.
"You can see why taking a bold step to save 20 percent of the budget would justify a serious move," said Paul Hill, the founder of the Center on Reinventing Public Education (CRPE) at the University of Washington Bothell. "But a bold step to profoundly change the use of time and cut the number of school days by 20 percent and save 1 percent, that's a little different story, and I think that's what people are finding."