A review of the literature on job analysis and job evaluation reveals several aspects of jobs which are important to organizations. To better explain the psychological dimensions of the work environment, three models of perceived job characteristics were compared using confirmatory factor analysis: Walsh, Taber, and Beehr's (1980) components of information and action; Ryan's (1982) classification of environmental events into controlling and informational; and a third model based on an integration of the two previous models, including three dimensions: control, stimulus uncertainty (information processing amount), and response uncertainty (information processing equivicality). Employees of a private sector information processing organization (N=119) completed Likert-type questionnaires comprised of 58 items representing the 12 variables encompassed by the three models (e.g., decision making authority, leadership responsibilities, job complexity, information processing amount). Model one fit the data least well, with models two and three showing significant improvement in accounting for the covariances among the 12 variables. Stimulus and response uncertainty were found to be highly correlated, suggesting a hierarchical model in which control and information are significant dimensions of perceived job characteristics. Seventeen references are listed. (MCF)