As one of the salient public relations practitioners' functions, internal and external communication is a vital tool to create success for an organization. This study examined an internal and external theory: Theory X and Y and Grunig's public relations models to ascertain the intersections of these two areas of communication.The researcher utilized a Likert-type questionnaire which was oriented to Theory X and Y, and a Q sort which was oriented to Grunig's public relations models to 35 individuals that assumed a public relations managers' role.Upon analysis of results, the research showed that there was no relationship between organizational internal management style and organizational external communication style. Specifically, Theory X and Y was not related to Grunig's public relations models. Also, there were less intersections and effects regarding the demographics with this study. However, the researcher found that five out of six respondents with 10 or more years of experience supported the proposed research questions. / Department of Journalism