Here in Illinois, how much money a school has - and whether it can offer extras like foreign languages and AP classes, or even pay for basic facilities - depends mostly on where that school is.

The difference in annual spending between the wealthiest district and the poorest has grown to $19,361 per pupil, according to the most recent school-spending data and a Chicago Tribune analysis. It's a staggering figure even in a state known for wide funding gaps, and Illinois is starting to give the kind of attention to the issue that courts have forced in a handful of other states. Still, even as education reformers call for higher taxes and increased funds for the poorest districts, others point out that more money often doesn't lead to better schools.

The factors that improve student performance often seem a fuzzy list of hard-to-define assets like good teachers, effective principals, smaller classes, and the right curricula, only some of which are directly related to dollars.

But it's also hard to get away from at least a few cash-related questions.

"Just giving more money doesn't solve the problems of achievement," says Kevin Carey, director of policy research for the Education Trust. "But in order to run an effective school, you have to have enough money and you have to spend it well. It's not an either-or situation."

Mr. Carey points out that per-pupil figures often illustrate only a portion of the inequalities, since there are typically much higher costs associated with educating low-income students: extra tutoring, special education, individual education plans. The generally accepted figure is an additional 40 percent for low-income students.

When that amount is factored in, an Education Trust report showed a difference of $2,465 per student between the top and bottom quartile of districts in Illinois.

Those sorts of figures, however, anger some education reformers who consider school funding a distraction from the issues that really matter. They point to the fact that a few schools often manage to do well with very limited funds, and that many schools have seen influxes of money without a corresponding payoff in achievement.

"We should be worried about performance inequities," says Eric Hanushek, a senior fellow at the Hoover Institute at Stanford University, citing achievement gaps for minority and low-income students. "Unfortunately, they aren't very closely related to spending differences."

Until a district demonstrates it can spend money wisely, says Mr. Hanushek, it shouldn't be rewarded with more. A court decision like the recent New York one that said New York City schools should receive another $5.6 billion shifts the legislative conversation to pure funding matters, he says, "squeezing out more fundamental discussions of how to improve schools." The extra money for New York City, Hanushek suggests, is likely just to give more money to the same poor-quality teachers.

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