This study is investigating how patients with severe stable state COPD perceive the variability of their symptoms throughout the day, the week and the year; the impact of these variations on their daily activities or sleep quality and how they deal with their treatments. For this purpose patients will be asked to answer a questionnaire over the phone

Inclusion Criteria:

• Outpatients with a diagnosis of COPD
• FEV1<50% and FEV1/FVC<0.7 according to lung function data in medical records.
• Smoker or ex-smoker > 10 pack-years
• Informed consent obtained

Exclusion Criteria:

• Ongoing exacerbation of COPD or within the previous 3 months
• Any other significant respiratory disease (including asthma and allergic rhinitis)

Participating physicians (GPs and Respiratory physicians) will be asked to recruit 4 patients (on average). The first patients presenting for a consultation for any reason, who meet eligibility criteria, and give informed consent, should be enrolled.