The following definitions come from the Worksheet for Use by Institutions on the Assignment of Credit Hours and on Clock Hours. (Source: www.ncahlc.org/Information-for-Institutions/federal-compliance-program.html.)
Distance: For courses where instructors interact with students through one or more forms of distance delivery.
Federal Definition: Distance education/course means education that uses one or more of the {following} technologies (i) to deliver instruction to students who are separated from the instructor: and (ii) to support regular and substantive interaction between the students and the instructor, synchronously or asynchronously. The technologies used may include: (i) the internet; (ii) one way and two way transmissions through open broadcast, closed circuit, cable, microwave, broadband lines, fiber optics, satellite, or wireless communications devices; (iii) audioconferencing; or (iv) videocassettes, DVDs, and CD-Roms, if the videocassettes, DVDs or CD-Roms are used in conjunction with any of the technologies listed in clauses (i) through (iii).
Correspondence: For courses where instructors interact with students through mail or electronic interface according to a typically self-paced schedule.
Federal Definition: Correspondence education/course means: (1) Education provided through one or more courses by an institution under which the institution provides instructional materials, by mail or electronic transmission, including examinations on the materials, to students who are separated from the instructor. (2) Interaction between the instructor and the student is not regular and substantive, and is primarily initiated by the student. (3) Correspondence courses are typically self-paced. (4) Correspondence education is not distance education.