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This paper presents a top-down hierarchical approach to the simulation modeling of computer-based information systems. The modeling approach defines a series of progressively more detailed system models. The models range from a highest-level functional model, which can be defined in the earliest stages of system design, through several intermediate level models representing more detailed views of a system and yielding progressively more detailed predictions of system timing and resourcedblp:conf/anss/AitkenJ82 fatcat:5i6dsfwzongghd3xayxaexduva