The document discusses the importance of using modules in online courses to organize content. It recommends including an introduction, learning objectives, all learning materials, activities, and assessments for the module's topic in each module. Consistency across modules is important, including consistent naming, location of content, ordering of content, and scheduling of due dates. The document provides examples of different models for structuring a course into modules, including module-by-module, unit-by-unit, and project-based models. It emphasizes the importance of module structure for accessibility and universal design of online courses.