Despite the number of publications and the development of guidelines for the evaluation and management of various diseases, there are still many issues pertaining to their diagnosis and management that remain controversial. This session will present 3 such controversial topics in a"Pro/Con" format. The first topic refers to the clinical significance of the FEF25-75 in the evaluation of lung diseases. The second topic, discuss the clinical appropriateness of the most recent guidelines on bronchiolitis. The third topic is discussing the significance of the pulmonary evaluation of patients with Sickle Cell Disease.