The course will consist of a series of paired lectures covering several topics in pediatric respiratory physiology, reviewing first a test of lung function and the physiological principles underlying the test, and then the companion talk will review how that test demonstrates pathophysiology relating to a particular pediatric respiratory disease. An interactive format, using questions from the speakers and audience touchpads to give answers will be used to enhance audience participation, and to allow the participant to understand key concepts or to identify areas requiring additional study.