WHEN MASSACHUSETTS charter schools were still in their beta phase, it made sense to limit their number. As with other promising innovations — in technology, in medicine, in business — a gradual rollout of charter schools ensured that there would be ample time to monitor progress, adjust standards, fix bugs, and learn from experience.
Massachusetts learned well. Its experiment with state-chartered public schools has proved a phenomenal success. More than two decades after the original charter law was passed, the state's 69 charter schools (25 in Boston) are among the most effective urban public schools in America. As study after study has confirmed, the benefits of a Massachusetts charter-school education are profound. . . .