Inhaled bronchodilators, such as beta 2 agonists and anticholinergics, and inhaled corticosteroids are the mainstays of therapy in patients diagnosed with COPD. Anticholinergic bronchodilators or long acting muscarinic receptor antagonists function by blocking endogenous airway smooth muscle cholinergic tone. Treatment with anticholinergics has been shown to significantly improve forced expiratory volume in 1 second (FEV1), resting and dynamic lung hyperinflation, symptoms, and exercise capacity in patients with COPD. Currently tiotropium is the only approved long acting muscarinic antagonist available for treatment of COPD.This is a multicenter, randomized, double-blind, placebo-controlled, parallel group study to evaluate the efficacy and safety of GSK573719 Inhalation Powder of 2 doses when administered once-daily via Novel DPI compared with placebo over a treatment period of 12 weeks in subjects with COPD. There will be a total of 8 study clinic visits conducted on an outpatient basis. Subjects who meet the eligibility criteria at Screening (Visit 1) will complete a 5 to 9 days run-in period followed by a 12-week treatment period. There will be 8 clinic visits during three of which serial spirometry will be performed . The total duration of subject participation in the study will be approximately 14 weeks.