The effects of changes in the motivational properties of jobs on work attitudes and behaviors were assessed in a quasi-experimental design. A number of clerical jobs in a metropolitan bank were redesigned because of a technological innovation. Changes were made without regard for the motivational characteristics of the jobs, and without cognizance by bank personnel that there might be motivational consequences of the changes. Some jobs were made more complex and challenging, some less so, and the motivational properties of still others were essentially unaffected. Measures of job characteristics, employee attitudes, and work behaviors were collected before and after the changes. Results showed that general satisfaction, growth satisfaction, and internal motivation were affected by changes in job characteristics. Satisfaction with the work context was not affected. Effects of the changes on absenteeism and performance depended on the strength of employee growth needs, which also tended to moderate attitudinal reactions to the changes. Contrary to expectation, employee growth needs themselves were not affected by the altered motivational characteristics of the jobs. © 1978.