Publicly funded, privately run charter schools consume more than $900 million in state and local tax dollars. A comprehensive evaluation has been difficult. Today’s story is the last in a three-day series. It is a part of a multiyear project to create a database and authoritative stories so parents can make informed choices and the public can understand this form of government privatization.

Sunday: Many charter schools lack transparency.

Monday: Close ties between for-profit management companies and the boards raise questions about tax-free, nonprofit status.