You would have thought that correspondence courses are a long lost ancestor of distance education courses that you find in your institutions today. My assumption was that the old correspondence courses have evolved from the mailed out notebooks and Xeroxed pages to PDF files downloaded from the teachers website, to an asynchronous space where all the information is carefully build into a virtual learning environment where the learner can come and go as they please, learning at their own pace while chatting with the instructor and the other participants via email or discussion boards. However, today, I just learned that there is still a separate category of courses, correspondence courses that reside in the federal definition of learning environments.
What is the difference between a Correspondence course and Distance Education?
[The 2010 definition by the US Federal Government may surprise you]