A method for modeling the structure of large social systems has been developed which is based on the interpersonal communication networks present in the functioning system. Recent developments in techniques and computer software have made possible the analysis of networks of several thousand persons. The new technique provides a method for describing social systems which is based on emergent systems properties, rather than arbitrary, prior expectations. A general overview of the recent advances which have brought about these new techniques of analysis is presented. (Author/WH)