The document discusses different communication styles: - Tell style is used for upward communication like reports where the communicator is authoritative. - Sell style is used to get an audience to change actions and the communicator is participative. - Confer style is used to gather information or opinions from an audience when the communicator does not know the answer and wants to learn, making the communicator democratic. - Join style requires high audience involvement when mutual efforts are needed and the communicator is delegative. The document also discusses establishing credibility with an audience by considering factors like rank, goodwill, expertise, image and morality. Enhancing initial credibility can be done through promotions while acquired credibility is earned through achieving communication goals.