Some of the most dramatic gains in urban education have come from school districts using what is known as a "portfolio strategy." Under this approach, districts negotiate performance agreements with public schools--traditional, charter, and hybrid models. The arrangement affords school leaders substantial autonomy to handcraft their…

In a decade and a half, the charter school movement has gone from a glimmer in the eyes of a few Minnesota reformers to a maturing sector of America's public education system. Now, like all 15-year-olds, chartering must find its own place in the world. First, advocates must answer a fundamental question: What type of relationship should the…