1) The document discusses various organizations that participate in integrated marketing communications (IMC), including advertisers, advertising agencies, public relations firms, interactive agencies, and more. 2) It examines different structures companies use to organize their advertising and promotion efforts, such as centralized, decentralized, and using an in-house agency. 3) The roles of different types of agencies are outlined, including full-service agencies, creative boutiques, media specialists, direct marketing agencies, public relations firms, and interactive agencies.