The trouble the system now faces is that a literal reading of state statutes, it acknowledges, would provide charters with about $13,000 per pupil, far more than the $9,387 North Avenue has allocated this year. Should a judge rule that the schools must follow that standard — and given the letter of the law, it's hard to see another conclusion — it could be ruinous for the system, and more pertinently, the students in traditional schools. Nobody wants that. Litigation also isn't the ideal route for the charters, given the time and expense involved. In the short term, a mediated solution is in the best interests of all sides.