The school library media specialists offer the users assistance in using information resources and instructional media by assessing, evaluating and selecting the most appropriate materials for the present educational situation in school. The format of the information media and the scope of the media center collection have constantly been changed by information technology. Media specialist has to know the selection criteria to be capable of providing any media format in the technological society, particularly of providing instruction software(courseware), multimedia, hypermedia and digital reference service to maintain the school library media center as one of the user oriented educational information centers. This paper presents the selection criteria for the instruction media by media format as one of the useful guidelines to the media specialist.