Job performance is highly relevant for organizations and individuals alike. Individual Job performance is the behavioural outcome of an employee which points out that the employee is showing positive attitudes towards his or her organization. Job performance is differently defined and measured in different disciplines in different ways. The main purpose of this paper is to define and to review theoretically and empirically the concept of job performance, measurement dimensions of job performance and empirical findings for measurement dimensions of job performance with reference to the various professions in service oriented organizations. As a desk research, this study reviewed literature regarding job performance and its dynamic nature, compared and analyzed dimensions (taxonomies) related to job performance, created a new definition and explained the importance of job performance adding novelty to the existing literature and provided suggestions for further studies.