Who else wants to be able to communicate effectively? From early theorists to modern social scientists studies in communication have undergone a number of significant changes. Many of the concepts of early researchers can be seen to underpin many of the practices of business communication today. Whether in an internal sense where radical change is fundamental to success to an external change to improve market share, it means leaders must be credible. This book explains the basis of that credibility and the four key aspects of persuasion, which are essential skills for a business person to be successful.