A good-looking course is not a guarantee of its instructional effectiveness. Think of all those magazines with glossy covers that you flip over expectantly only to find that the pages are filled with trash. Unfortunately, many course developers have no clue of how visual design can increase (or decrease) learnability of the material. Think back to your own learning experiences to understand cognitive load. There was always some subject in school that was, by nature, difficult to comprehend—a topic with a high intrinsic cognitive load. Sometimes text books, with sketchy or roundabout explanations and unrelated analogies, made it difficult for you to make sense of the content. These books increased the extraneous cognitive load and were ineffective. But almost all of us have been taught by some great teachers who simplified challenging learning matter with diagrams, charts, and demonstrations. They helped us learn and master the subject by reducing the extraneous cognitive load.