Year-Round Schools: In Brief. Congressional Research Service, Library of Congress. Rebecca R. Skinner. June 9, 2014.
In general, year-round schools are schools that reorganize a traditional school year without allowing for any extended breaks in instruction (e.g., 10-week summer vacation). Rather, the days usually included in summer break are redistributed to create regular breaks throughout the year. The research on the extent to which year-round schools affect student achievement has generally been found to be inconclusive and lacking in methodological rigor. There is some consensus that year-round schooling has no effect or a small positive effect on student performance; however, the quality of the studies that led to these findings has been questioned.
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