What is Correspondence Education ?
Correspondence Education meaning Education provided through one or more courses in which the institution provides instructional materials and examinations by mail or electronic transmission to students who are separated from the instruction. Interaction between the instructor and the student is not regular and substantive, and it is primarily initiated by the student. Correspondence courses are typically self-paced. Correspondence education is not distance education.
reference: IPEDS Data Collectrion System – Glossary