Beware of the Easy School Fix

Jay Matthews:

When fixing schools, beware of miracle cures. Every week people send me ideas they say will change the future of education and lead all humanity to enlightenment. So, when management expert William G. Ouchi let me look at his new work on the surprising power of total student loads per teacher, or TSL, I was skeptical.

He says when middle or high school principals are given control of their schools' budgets -- a rare occurrence in big districts -- they tend to make changes in staffing, curriculum and scheduling that sharply reduce TSL, the number of students each of their teachers is responsible for. Some urban districts have TSLs approaching 200 kids per teacher. But after principals get budgeting power, the load drops sharply, sometimes to as low as 80 kids per instructor. When that happens, the portion of students scoring "proficient" on state tests climbs. A group of New York schools had a surge of 11 percentage points after they reduced average TSL by 25 students per teacher.

I hear the mumbles out there. Yes, correlation is not causation. Test scores are not a perfect measure. Many other factors could explain the rise in achievement. For instance, the principals might be using their new powers to hire good teachers and fire bad ones.

Posted by Jim Zellmer at September 26, 2008 9:20 AM
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