The field of information management and information service suffered seriously change of it's job and duties. In this study, inter-occupational relationship in job analysis is examined with 8 kinds of job analyses and verified the intimateness. As a consequence the capability of inter-occupational changing is suggested and trend of vocational change is studied through Korean Standard Classification of Occupations. there is five parts tasks within eight jobs with KJ techniques and affinity diagram within jobs are figured out.