Internal disposition is the crux of the latest method of explaining job satisfaction which hints some people being inclined to be satisfied or dissatisfied with their work irrespective of the nature of the job or the organizational environment (Jex, 2002). More simply put, some people are genetically positive in disposition (the glass half full), whereas others are innately negative in disposition (the glass half empty). For instance, a study of twins who were reared apart (same genetic characteristics but different experiences) found that 30 percent of inconsistency in satisfaction was accredited to genetic factors (Arvey et al., 1989). Although individuals change jobs and employers, individual disposition has been shown to be consistent by the use of survey results on job satisfaction (Staw & Ross, 1985). Additionally, Staw et al. (1986) found that adolescent evaluations of affective disposition were correlated with adult job satisfaction as many as forty years later.