It smells like bad managers or simple corruption:

In a period when enrollment has declined by almost 8,000 students, BPS has added more than 1,400 employees, justified in part by these generous estimates. More than 200 more positions will be added next year. Backed up by an even-worse long-term projection that wrongly predicted enrollment would rebound, the district put off hard decisions to close schools, even though it knew it already had excess space.

Source: BPS overestimates student enrollment numbers. Here’s why it matters – The Boston Globe