None of your links show it improved student performance, the first study is very preliminary and only showed basically parents and students liked the schools. You can achieve the same mimimum standard without vouchers and have better results with charter and magnet schools.
minimum standards, thats what the measure of success is?
lol
heres a thought, pay teachers a decent wage.
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"The greatest danger for most of us is not that our aim is too high and we miss it, but that it is too low and we reach it." - Michelangelo.