This document proposes the adoption of a rules-based theoretical perspective for the study of family interaction. In the first section, Logical and Empirical Requirements, concepts and basic assumptions pertinent to rules theory are considered. The concepts of coordination and determinacy, as used in a rules framework, are explained, and logical and empirical requirements for theory construction are delineated. The second section, Research Interpretations and Applications, proposes the examination of communication as a central family process in order to operationalize family systems theory. Communication is defined and discussed in relation to interrelated family structure, family process, rules theory and systems theory. (WAS)