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The chart plots a dot for every school that received state money to create new classrooms. The dot represents the amount of money the school received, and the amount that the school's average class size changed. (Data via the Department of Education)

We’ve already reported that average class sizes citywide did not decline last year, despite an infusion of money meant to reduce them. New data suggest the same relationship happens at the school level: Even schools that reported spending hundreds of thousands of dollars on class-size reduction efforts, such as creating new classrooms, did not necessarily see a drop in average class sizes.

Rather, while some schools that reported investing in new classrooms did end up reducing class sizes on average, others actually saw their average class size go up. The data, provided by the Department of Education following a tug-of-war that you might recall, are summarized in the graph above and in a searchable file available here.

The major challenge, according to the schools official who compiled the data, Tania Shinkawa, is not that principals didn’t spend the money as they were supposed to, but that even that pot of money didn’t guarantee that they could lower class sizes across the board.

Take Bronx elementary school PS 57, which reported that it spent $190,000 to open new classes. Let’s be generous and say that the money could pay for three additional teachers. That could go a long way toward reducing class sizes in three grade levels. But would it necessarily lower the entire school’s average class size?

No. (more…)