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This dissertation seeks to investigate the efficiency of diaphragmatic breathing and examines its methods of instruction. Firstly, it deals with the study of anatomy, physiology, mechanical action and diaphragmatic function. The total amount of the respiratory exercises used in pulmonary rehabilitation is described. In addition, the clinical reasoning along with their evidence is mentioned. The effects of diaphragmatic breathing on Chronic Obstructive Pulmonary Disease patients are analyzed in relation to the disease severity stage, in terms of symptoms, ventilation, chest wall motion, pulmonary function, respiratory rate and arterial blood gases. Furthermore, apart from the respiratory system, the efficiency of diaphragmatic breathing is assessed on the cardiac and the lymphatic function. Then, the existing methods of instruction and evaluation of diaphragmatic excursion are examined. Finally, the pilot study conducted for this dissertation is presented. In particular, the study aims to investigate the effectiveness of the experimental biofeedback device, developed by the writer and her colleagues, concerning the instruction of diaphragmatic breathing. The results show that the device equipped with the visual biofeedback provides the trainee with an incentive to better perform diaphragmatic breathing exercise and appears to be ahead of the established method of instruction.