A central data system in Arizona envisioned by State Superintendent of Public Instruction John Huppenthal would likely cost about $40 million to implement. Such a system would give teachers and parents instant access to a wide variety of data, such as students' testing data, absences and schools' performance. Supporters of such a system say that without it, schools are limited in the information they can access on students -- hampering their abilities to help them succeed.

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