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Reference.org
Modular scheduling
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<p>Modular scheduling (also known as flex scheduling, flexible modular scheduling, or modular flex scheduling) is a system of <a href="/facts/School_timetable/I6w0vQ8v">timetabling</a> in certain <a href="/facts/High_school_(North_America)/B9AVAk0k">high schools</a> in the United States. </p>