The Information System for Vocational Decision (ISVD) approach to computer-managed information is explained. Drawing mainly from the experience of preparing datafiles of occupational and military information for the ISVD, the author supports and elaborates on a number of general statements: (1) data should be collected and presented specifically to aid students in their vocational decisions; (2) data should be treated in a systematic and structured form that exploits high speed commutation; (3) ready-made sources of information should be relied upon as far as possible; (4) data should be articulated from distinct and diverse sources into a working whole; (5) datafiles and means of access to them should be prepared separate from one another so they can be used in a variety of combinations; and (6) information given by the system should be suggestive, not prescriptive. Other specific criteria and general rules for their implementation are discussed in the final section of the paper. (TL)