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The questions are written by the AP Biology Development Committee and by outside writers who are part of the AP community. The exams are then assembled according to percentages and topics in the Course Description. Essays are chosen from many potential questions on a particular topic and then honed for clarity, breadth, and exactness. Original individual exam items are reviewed two or more times by the Development Committee, most are field-tested in college classes, and 100 questions make the cut. These include discrete questions (stand-alone items), common answer choice (series of 4-5 concepts to be applied), and lab or data set series (3-4 analytical questions over the information presented). Statisticians at ETS make sure the exam includes some items that are relatively easy and others that are very discriminating, and that the exam stays at approximately the same difficulty level from year to year. -- Carolyn Schofield
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