Describes the authors' views about a new type of computer "environment" that is both needed and possible for modeling and analysis. This Note also describes a relatively concrete plan for developing and testing prototype versions of such an environment at RAND, with the intention of later exporting successful tools and methods to other analytic organizations inside and outside government. Work consistent with the plan is now well under way, but it will take years to realize the vision. Further, many elements of the approach reflect judgments and hypotheses that will need to be revisited and iterated as experience is gained with the prototypes. Although it was developed for internal purposes, this Note is being published because of interest in the effort expressed by many colleagues in the scientific and analytic community, many of whom are concerned with similar issues.
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