In a job analysis, subject matter experts, including post-holder, the superior of the post-holder and HR experts, etc. evaluate specific task and the post-holder’s job-related knowledge, skills, abilities and other characteristics(KSAOs). For a
certain job, however, different people (such as different post-holders) usually provide diverse information, resulting in different job analysis ratings. Past experiences show that these differences in job analysis are inevitable (Harvey,
1991). Most of earliest studies on job analysis only focused on the effect of demographic variables, such as gender, age, nationality, academic degree, etc. upon job analysis ratings(Mullins and Kimbrough, 1988; Avolio and Waldman, 1989; Schmitt and Cohen, 1989; Landy and Vasey, 1991).