Athletic training students require strong critical thinking skills in order to make decisions for the health and safety of their athletes. Research has shown that these skills are difficult to develop. Simulation learning is often used in healthcare education as a way to build these critical thinking skills. This action research study sought to examine how different simulation learning activities contribute to the development of critical thinking skills in athletic training students. Students completed a number of simulation-based learning activities and rated their ability to develop skills that contribute to the ability to think critically. The findings from this study suggest that different activities develop different areas of critical thinking. Athletic training instructors should use a combination of activities and work to identify specific weaknesses in students in order to improve overall critical thinking abilities. [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.]