See an excerpt of a report in Ed Week:

The Boston district’s move to begin its hiring process earlier and to allow principals more say over who they bring on board has resulted in a stronger and more diverse pool of teacher candidates, a new analysis concludes.

But the shift has also bumped up against some of the same challenges that have complicated similar efforts elsewhere—notably a costly pool of teachers without permanent positions, says the report from the Boston Municipal Research Bureau, an independent nonprofit organization that reviews city policies…

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