RATIONALE None of the inhaled treatments is likely to be adopted and to replace the use of OCS for the treatment of AECOPD unless it is used promptly at the onset of symptom worsening. Early treatment has been shown to have clinical importance in accelerating symptom recovery and reducing hospital admission. Recently, the investigators have demonstrated that the early treatment of AECOPD can be achieved by the implementation of a written action plan as part of a self-management education.