This paper explores systems of classification to develop a conceptual model adequate as an organized knowledge base for organizational communication research findings. The paper notes that present classification systems employed in organizational communication textbooks and in reviews of organizational literature are not adequate to the task of furnishing a comprehensive and organized knowledge base. It then proposes a determinant-outcome classification system in response to this need. The proposed system consists of four outcome variables, six determinant variables, and four types of communication interface and treats communication as a determinant variable that influences outcome variables and other determinant variables. The paper contends that, as a determinant variable, communication may be independent or dependent in accordance with the circumstances. In addition, the paper notes that the further development and application of this conceptual model could result in an "inventory of propositions," each proposition relating to a class formed by an independent variable influencing a dependent variable in a specific type of communication interface. (Author/FL)