Although Advanced Placement (AP) courses are intended to promote rigorous, college-level instruction for high school students, AP tests have been criticized for privileging breadth over depth. In response to both this criticism and to the 2002 National Research Council (NRC) report on STEM education, AP Biology, Chemistry, and Physics curricula and exams were redesigned in 2013, 2014, and 2015 respectively. These courses now emphasize scientific inquiry and reasoning, as well as depth of understanding for big ideas in science, over fixed, broad content coverage of facts. Subsequent NRC STEM reports (National Research Council 2012, 2011), the Framework for K-12 Science Education, and the Next Generation Science Standards have emphasized the importance of this shift. These are sweeping changes to a long-standing instructional program. Hundreds of thousands of AP science students -- and more than 16,000 teachers -- are now challenged to succeed on a high-stakes test about the inquiry process, real-world applications of scientific principles, and synthesis of complex content knowledge. To help teachers learn about the revisions, the College Board and other providers offer a range of professional development options, from weeklong summer workshops to short face-to-face courses, online self-paced courses, downloadable resources, and online peer-learning communities. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com.bibliotheek.ehb.be/en-US/products/dissertations/individuals.shtml.]