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    <abstract>Interactive simulation, also known as operational gaming, is a preanalytical tool intended to provide a better intuitive understanding of a given problem situation and to lead through successive approximation to the construction of a realistic analytical model. 

There are two essential features that distinguish interactive simulation from ordinary simulation modeling: Interactive simulation includes the relevant decisionmakers among the elements being simulated (by knowledgeable individuals acting as players); and it is dynamic in nature, in that it utilizes the expertise of these players to improve the structure and numerical parameters of the game between plays. 

This paper presents a description of a relatively sophisticated six-person game, called GEM, which attempts to simulate the economic planning and interaction of six world regions.</abstract>
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