This Note describes the author's experiences with an object-oriented simulation system, the RAND Integrated Simulation Environment (RISE), and two projects named AGE and SUSAN. The system incorporates digital terrain, roads, railroads, rivers, conceptual terrain entities, autonomously behaving objects, computer graphics and animation, interactive user interfaces, and multiprocessing. It emphasizes autonomous behavior over complex scripts generated by human players, thus greatly shortening the scenario preparation time required of other such models. The system emphasizes portability and speed and exhibits significant scale-up capabilities — tens of thousands of objects rather than hundreds.
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