Computer-based career planning systems have been a reality for 25 years. Over this time span, the technology has changed dramatically--from very expensive, slow, low-storage mainframe computers to low-cost, fast, high-storage microcomputers. Similarly, the presentation made possible by the technology has changed from screens without color packed with text to screens with color, high-resolution graphics, and less text. However, the basic content of comprehensive computer-based career planning systems has changed far less. The first component is a hidden skeleton or outline which expresses the developer's concept of what individuals need in order to accomplish developmental tasks or make informed career decisions. The second component is assessment tools. Assessment data may be acquired by taking inventories on-line or entering results from print form inventories. The third component is databases. These are files of frequently-updated and accurate information about such things as occupations, schools, financial aid, etc. The fourth component is search strategies to help users quickly identify options as well as get detailed information about them. By modifying any or all of these components, substantially different systems can be assembled for a broad variety of populations and settings.(ABL)