 After a stroke, many patients are left with an impaired arm. Restricting the use of the good arm may improve the use of the bad arm. In Constraint-Induced Movement therapy CI therapy, the good arm is put in a sling to force increased use of the bad arm. The bad arm is also trained each day for several weeks. This study will evaluate the effectiveness of CI therapy in patients with chronic disability after stroke and whether the rate of recovery is decreased in elderly patients. 