This document discusses key elements of message design for advertisements. It explains that the advertisement should interest the audience, provide new or supporting information, and influence their attitudes favorably. The message consists of an idea that highlights the product's uniqueness to capture consumers' minds. Key elements of message design include positioning, marketing objectives, communication approach, message presentation, and structure. Good message structure draws conclusions, uses repetition, considers one-sided versus two-sided communication, and determines the order of arguments.