Abstract
This study investigated differences in the psychological involvement and task assignments of labor-contractor and employee engineers and the effects of the contractors on the attitudes of their employee co-workers. Findings partly supported the hypothesis that supervisors shift interdependent tasks to employees when contractors are present in their work groups. However, employees were not found to have greater quasi-moral involvement than contractors. In addition, the presence of contractor co-workers was associated with employee reports of lower organizational trustworthiness, as expected.