Audience outlines focus on the expectations or needs of the audience--those who will use the project you are creating. Some projects are very strictly guided by what the audience needs or wants. For instance, an application for admission to a university usually stipulates exactly what you need to include, and in what order. If you do not provide exactly what you are asked for, your audience is not likely to grant you admission! But, even when the audience does not directly guide a project, it's still a good idea to consider how they will "experience" the project, once it's finished.