This guideline offers best practice advice on the identification and care of patients with chronic obstructive pulmonary disease (COPD). It aims to define the symptoms, signs and investigations required to establish a diagnosis of COPD. It also aims to define the factors that are necessary to assess its severity, provide prognostic information and guide best management. It gives guidance on the pharmacological and non-pharmacological treatment of patients with stable COPD, and on the management of exacerbations. The interface with surgery and intensive therapy units (ITU) are also discussed.