Arlene C. Ackerman, who took the helm of Philadelphia's public schools a little more than a year ago, is pushing for changes that would upend how teachers are paid and assigned to schools. The veteran urban superintendent is battling tradition in the 167,000-student system, but insists that increasing the effectiveness of the city's nearly 10,700…

A variety of federally financed grants based on performance pay are providing insights into how districts and teachers can collaborate to implement sustainable programs designed to improve teaching and learning. The question of whether those Teacher Incentive Fund grants will yield measurably higher student achievement, applicant pools with…