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Chronic obstructive pulmonary disease (COPD) is one of the leading causes of morbidity and mortality worldwide. Although predominantly denoted as a pulmonary disease, COPD also presents with various extra-pulmonary effects which influence different aspects of patients' physical, emotional and mental well-being. Traditionally, evaluation of COPD severity is based on determination of pulmonary function and particularly on forced expiratory volume in 1 second (FEV1). However, numerous evidences show that FEV1 is not a parameter of sufficient strength when compared to the value of clinical symptoms, e.g. shortness of breath, cough, and COPD patients' quality of life (QoL). Besides, many clinical manifestations of COPD (anxiety, depression and decreased physical ability) are best expressed by patients themselves, and can be better determined by appropriate questionnaires. Some of currently recommended questionnaires used worldwide are CAT (COPD assessment test) and modified Medical Research Council (mMRC) dyspnea score, in combination with FEV1. Global initiative for COPD -- GOLD with its current directives from 2013 includes CAT and mMRC parallel with a number of clinical exacerbations and FEV1 as the most valid parameters and based on that, introduces COPD classification into four groups -- A,B,C and D, according to the severity of disease. Therefore, we consider that a full insight into the patient's QoL and treatment efficacy are impossible without introduction of these self-evaluation questionnaires to the classical instrumental respiratory function evaluation in COPD patients. [ABSTRACT FROM AUTHOR]