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In today's complex, interdependent economy, business and government policy makers are becoming increasingly aware of the need for comprehensive planning. They realize if resources are to be allocated to their most productive uses, it is necessary to know not only the direct effect of a given decision, but also the various indirect effects. The purpose of this paper is to provide public and private decision makers in Southeast Texas with an efficient planning model by identifying the structural interdependencies that exist in the regional economy. The Input-Output Model which is presented in the paper describes the structural relationships that exist in the regional economy and estimates the direct plus indirect output requirements of one regional sector by another per dollar of output delivered to final consumers by the latter sector. Data included in the model were collected from a representative sample of firms within each regional sector.