This guidance support systems handbook was designed to assist local, regional, or State guidance personnel who wish to develop locally-relevant career information materials. These materials may serve as a career information system or may be used to supplement commercial materials which are national in scope. Sections of the handbook cover conceptualization of a career information system; implementing the models for career information systems grades 7-9 and grades 10-12; guidelines for local development of a career information system; and uses of the career information system in career education. Definitions of the 12 career clusters adopted by the school-based career education project, a job description checklist, and a bibliography are appended. (Author/MF)