The Challenge Index ranks high schools according to how many students take AP and IB exams, not on how well they do or how many pass. This index is published in Newsweek and the magazine calls it "America's Best High Schools." In this article, the author, also the creator of this index, answers some frequently asked questions about the index and why he compiles it. He explains that the Challenge Index is derived by taking the total number of AP or IB tests given at a school in May and dividing it by the number of seniors graduating in June. All schools that achieve a ratio of at least 1.000--meaning they have as many tests in 2005 as they had graduates--will be included on the list on the "Newsweek" Web site, and "Newsweek" will identify the top 100 schools in the magazine. He also explains that he counts only the number of tests given and not how well the students do on the tests because most of U.S. high schools keep their passing rates artificially high by allowing only A or very strong B students to take the courses. In some cases, schools open the courses to all students, but wrongly encourage only the best students to take the tests.