Introduction: The GOLD 2011 document outlines a new classification system for COPD combining spirometry, symptom assessment, and exacerbation risk to identify disease severity. We postulated that grouping would be different which symptom scale is used to differentiate between high and low symtoms. Methods: Outpatients with COPD were enrolled at Chonnam University Hospital from Jan to June in 2012. The patients with COPD were categorized into A, B, C, and D according to the 2011 GOLD report. Additionally, correlations between mMRC scores and each domain of CAT scores were analyzed to assess which domain is closely related to mMRC. Results: Group assignment using the mMRC scale versus CAT score were different among 257 COPD patients. Using mMRC scale, 143 (55.6%) patients were assigned to group A, 64 (24.9%) to group B, 17 (6.6%) to group C, and 33 (12.8%) to group D; on the basis of the CAT score, 76 (29.6%) patients were assigned to group A, 131 (51.0%) to group B, 6 (2.3%) to group C, and 44 (17.1%) to group D. The mMRC score had the strongest correlation with the domain of dyspnea among CAT components (r=0.731, p＜0.001). However, the correlation between mMRC and the domain of sputum in CAT was weak (r=0.290, p＜0.001). Conclusions: The relative number of patients with group C was low. The group classification of COPD produced by each symptom scale were different. Care should be taken when comparing patients identified with one symptom scale versus another. Further study will be needed to assess how the choice of symptom measure matters.