Back in the mid-2000s, in public and in the news media, Joseph P. Burke, then superintendent of the Springfield public schools, and Timothy T. Collins, president of the local teachers' union, often seemed to be at odds with each other. Out of the public eye, however, the two men had begun meeting regularly. When Burke left the district, the work…

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…