It is a fact that globalization has come to intercept our daily lives and affect society through chain reaction phenomena. These changes affect the way we analyze public and private organizations and their communication. Our goal is to address the past and present of the two types of institutions in our country, to understand whether and how the standards of procedure in public and private organizations have points of contact and which domains, strategies and techniques they have used in the information society.

Keywords : Corporate Communication, Communication Models, Portuguese private and public organizations.