PRESENTS 3 INTERESTING CONNOTATIONS OF SIMULATION: (1) REPRESENTATION OR SUBSTITUTION OF 1 THING FOR ANOTHER; (2) PORTRAYAL OF THE ENVIRONMENT, WHICH SUGGESTS THE STUDY OF PERCEPTION; AND (3) DYNAMIC SYSTEMS AND THE FUNCTION OF COMPUTERS IN THEIR REPRESENTATION. EXPLORES THE USES OF SIMULATION FROM THE POINT OF VIEW OF RESEARCH AND DEVELOPMENT IN TRAINING. MAJOR SECTIONS ARE THE FIELD OF SIMULATION, OPEN-LOOP ENVIRONMENTAL SIMULATION, SIMULATION NOT INVOLVING PEOPLE, ANALYSES OF OCCUPATIONS, SIMULATION FOR TRAINING, REAL-SIZE SYSTEM SIMULATION, TECHNIQUES OF MINIATURIZATION, SIMULATION WITH EMPHASIS ON THE PEOPLE INVOLVED, AND SIMULATION FOR PROFICIENCY MEASUREMENT. 5 DIMENSIONS OF SIMULATION ARE IDENTIFIED. (31 REF.)