An outline is a well-balanced composition that applies the concepts of:1. Parallelism: The structure of an outline should use the same level of headings for similar items or topics. 2. Coordination: An outline should contain headings and subheadings that show the relationship between various aspects of a topic. 3. Subordination: An outline organizes information in a hierarchical structure, with main topics at the top and subtopics beneath them. 4. Division: An outline should divide a topic into sections or subsections so that its parts can be easily understood and discussed.