Jason, In the grand scheme of things you don't. This is the tragic part of teaching. The intent of "No Child Left Behind" was that each and every student would arrive at high school graduation with the same set of skills and knowledge. Since we are dealing with human beings that was never going to happen. So what instructors do is to offer content in a number of different ways and see to engage the majority of students in the process. By using different delivery methods students can use their different preferences and become knowledgeable. A long way from a perfect system. Gary Gary Meers, Ed.D.