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"Today, charter schools are promoted not as ways to collaborate with public schools but as competitors that will force them to get better or go out of business. In fact, they have become the force for privatization that Shanker feared. Because of the high-stakes testing regime created by President George W. Bush’s No Child Left Behind (NCLB) legislation, charter schools compete to get higher test scores than regular public schools and thus have an incentive to avoid students who might pull down their scores. Under NCLB, low-performing schools may be closed, while high-performing ones may get bonuses. Some charter schools “counsel out” or expel students just before state testing day. Some have high attrition rates, especially among lower-performing students."
Diane Ravitch
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