These give further reinforcement of skills and concepts in the lesson, and offer more challenging problems for advanced or highly motivated students. The more difficult a subject is, the more important it becomes for training materials to be clear and easy to follow. To evaluate this aspect of training materials, simply read through samples from each training provider. Make ample use of visuals. Use consistent signposts.
Signposts are design elements that indicate the presence of a specific kind of content.
A signpost can be an icon that signals a tip, a box that signals extra information, or a heading that signals a hands-on practice exercise. Properly used, signposts make training materials easier to follow and are a tremendous aid to learning. Be flexible enough to handle the needs of different students. Different students often start the same course with widely different levels of skill. Training materials should either be structured in a nonlinear fashion so students can skip parts they don't need, or customized for each students particular training needs.