This is a cross-sectional validation study, designed to evaluate the discriminative validity of the Chronic Obstructive Pulmonary Disease Assessment Test translated in a local language in patients with Chronic Obstructive Pulmonary Disease.

The Chronic obstructive pulmonary disease Assessment Test is a new questionnaire that has been developed recently to improve communication between doctors and patients. It is known to have good relationship with other measures of quality of life. For the wider application to practice, it has been translated into a local language in many countries.

Inclusion Criteria:

Subjects eligible for enrolment in the study must meet all of the following criteria:

1. Type of subject: Outpatients
2. Informed consent: Subjects must give their signed and dated written informed consent to participate.
3. Gender: Male or Female
4. Age: 40 years of age or older at a clinic visit
5. COPD diagnosis: Subjects with an established diagnosis of COPD in the past 6 months or before.
6. Tobacco use: Smokers or ex-smokers with a smoking history of more than 10 pack years.

Exclusion Criteria:

1. Asthma: Subjects with a current diagnosis of asthma. Subjects with a prior history of asthma are eligible if COPD is the current diagnosis.
2. Lung diseases: Subjects with current active respiratory disorders other than COPD, e.g. lung cancer, tuberculosis.
3. Non-compliance: Unable to complete questionnaires

Males and females 40 years of age or older with a diagnosis of COPD are eligible. Subjects will complete questionnaires and perform spirometry at a single visit.