mehdi_mosad@yahoo.com

Hackman and Oldham describe psychological states under the titles of variety of skills, identity of duty, significance of duty, independence and authority, and job feedback. First three features affect the significance of the performed task. The fourth feature (independence) influences responsibility for the performed task. And the last feature (feedback) refers to awareness of the results of the performed task. On the whole, these psychological states determine the four major results which are occupational satisfaction, internal motivation for work, work performance, and absence and transfer. In spite of all its advantages, this model has its own limitations. The first limitation concerns the personal nature of these five features. The second limitation is the role of psychological states in connecting job features and results. The third problem is the modifying effects of the need for growth, occupational satisfaction, and scientific skill. And the fourth problem is that there is little backup for the effect of a particular problem on the potential motivation. In brief, in evaluating this model it must be mentioned that only Hackman’s five factors are not important and that also environment and community group matter. The model for processing social data of task design indicates that social realities build up personal needs, understanding of duties and reactions.

. Independent variables were Hackman’s five factors including variety of skills, significance of duty, identity of task, independence and authority, and feedback as well as three factors of personality, competence, and experience which were assumed in keeping with enhancing the organizational performance. Thus, the conceptual framework of the study was presented as :