When working with creating course materials, it is likely that IDs will use illustrations of some sort; they may be photo images, graphics, graphs, animations, and so on. There are some basic design best practices that can help instructional designers create meaningful courses.
There are studies that show that the majority of learners need to see information in order to learn it. For example, using illustrations can help learners see how things are related, grouped, and organized.
There are a number of visual elements that instructional designers use to enforce learning.