This research examines the decision facilitating role of CPMS on manager's role ambiguity and also influence of personality traits of locus of control between CPMS and job performance. Incorporating role theory and social learning theory, this research hypothesises that informational characteristic of CPMS is useful to reduce manager's role ambiguity and in turn enhance their job performance. Data were collected from 120 business unit managers of manufacturing firms listed in the Federation of Malaysian Manufacturers (FMM) 2011 Directory. The results provide evidence that CPMS reduces manager's role ambiguity, which in turn enhances job performance. Additionally, the results also indicate that locus of control moderates only the relation between CPMS and role ambiguity and that there is no evidence of moderation identified between CPMS and job performance.