(York) -- Governor Corbett has announced his four-part plan for education reform in Pennsylvania. The governor wants to put a state commission in charge of approving and overseeing charter schools. He says school districts shouldn’t hold all the power to approve new charters. Corbett also wants to see vouchers allow students from low-income families pick their school, when they would otherwise be attending one of the state’s worst-performing schools. But, he adds vouchers don’t leave public schools high and dry. "What moves to the new school is the state subsidy," he says. "The old school still keeps its taxes in their school district." The governor also wants to expand the tax credit program for businesses that fund scholarships. Corbett says teacher evaluations should be based in part on student performance and should help determine merit pay and tenure.