LET'S face it: The system of supervised correspondence instruction may be a wonderful tool administratively; it may have flexibility and adaptability in a thousand-and-one odd situations; it may look like the perfect answer to the problems of the small high school, the home-bound youngster, and so on. But, if it does not do a relatively successful job of teaching what is to be taught, all the rest is nothing. Therefore, in this chapter, let's look at some evidence: First, a summary of research on the subject, by one of the fore most students. Second, a more empitical description by one of the long-time leaders. And third, the evidence of success as it is shown in the steady growth of the movement.