Much attention has focused recently on using student test scores to evaluate public schools. The No Child Left Behind Act of 2002 requires states to test students and evaluate each school's progress toward having all students meet or exceed state standards. Under the law, however, schools only need to test 95% of their students. When some students…

In 2001, Illinois began administering the ACT (American College Testing) test to all 11th graders in Illinois public schools as part of the Prairie State Achievement Exam (PSAE). For the first time, ACT scores and background information were available for most public-school students who would be completing high school one year later, rather than…