This document contains the presentation slides for a talk on messaging given by Roger Friedensen to the North Carolina chapter of the Public Relations Society of America (NC PRSA) on November 3, 2010. The presentation discusses the importance of effective messaging and outlines some key principles for crafting good messages, including that they should be clear, concise, compelling and answer questions about relative advantage, compatibility, complexity and other factors. It also discusses the three modes of persuasion - ethos, pathos and logos - and provides examples of how messages appeal to each. The overarching message is that effective messaging is the essential ingredient for successful public relations and marketing communications.