STUDY PURPOSE: To study whether patients who have schizophrenia or schizoaffective disorder and are randomly assigned to switch to aripiprazole prior to participation in a brief vocational skills training (VST) will have improved cognitive functioning and learn more in VST than those randomly assigned to stay on olanzapine. There is evidence that VST is important in improving role functioning for schizophrenia patients, however, cognitive impairments limit the ability of some patients to benefit from skills training approaches. Patients switched from olanzapine to aripiprazole improve in terms of verbal learning and verbal learning has been shown to be a strong predictor of community outcome. It is unclear whether the cognitive benefits of switching to aripiprazole extend to improve learning of vocational skills.