Anne Arundel, Carroll, Baltimore, Howard and Harford counties offer financial incentives to attract and maintain teachers, but little data shows they actually work.

“It seems pretty clear that incentives up the number of applicants, but whether they work in the sense of raising student achievement and keeping the teachers” is unknown, said Ben Schaefer, program manager at the Washington, D.C.-based National Commission on Teaching and America?s Future, a nonprofit that promotes high-quality teachers.

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