DOE Instructional footprints shrinking through time
The original 2007 DOE Instructional Footprint, used to guide space allocation and changes in school utilization including co-locations, assumed class sizes of twenty students per class in grades K-3, and 25 students in grades 4-5 in non-Title One schools. (It did not say what class sizes were assumed for Title One schools).
In 2009, however, the Footprint raised class size standards for grades 4-5 to 28 students per class, without explanation. Then in 2011, the Footprint eliminated any standards for class size from the document completely, except in the case of alternative learning centers, transfer high schools, full time GED programs, and Young Adult Borough Centers.
In 2010, the Footprint shrunk the minimum size for regular classrooms from 600 square feet to 500 square feet in grades 1 through 12, and the minimum size for cluster rooms from 1000 to 500 square feet. See the links to all these versions of the Instructional Footprint, including the current Footprint revised in 2015 below.
2007 Instructional Footprint (entire spreadsheet here)
First page where it discusses class sizes here:
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