Miravitlles M, et al. - Researchers conducted this investigation to validate the concept of control in COPD {control = stability [no exacerbations or impairment in COPD Assessment Test (CAT) scores] + low impact (low level of symptoms)}. They noted that only 21% of patients fulfilled the proposed criteria of control. Changing the severity cut off of BODEx (Body mass index, Obstruction, Dyspnea and Exacerbations) from 5 to 3 did not change significantly the percentage of patients fulfilling the criteria of control. The suggested cut offs and their predictive value for poor outcomes need to be refined in prospective studies. The main reasons for patients not being classified as controlled included a high level of dyspnea, a high CAT score or an exacerbation in the previous 3 months.