Based on J. E. Grunig's four models of public relations practice (press agent/publicity, public information, and two-way asymmetric and two-way symmetric practice), this paper examines the potential applicability of these models to internal communication systems in organizations. Following an introduction, in which Grunig's models are briefly explained, the paper discusses definitional issues; historical parallels between the development of organizational theory and the development of the four models of public relations practice; issues of managerial bias inherent in existing organizational communication research and consulting practices, as well as in at least some of the public relations models; and lines of future inquiry of common interest to the public relations researcher and the organizational communications researcher as a function of the models. Forty-eight references are given. (Author/SR)