The need for correspondence courses was recognized early in the University's development but were used sporadically in the first two decades. Partly because of its dissatisfaction with the work of junior colleges, the University established extramural classes in 1929. Students were allowed to take five of the required fifteen classes beyond grade 12 (Hayden 122). Throughout World War II, correspondence courses were used extensively by the armed forces. The CBC National Farm Radio and Citizen's Forum combined correspondence and radio by sending material out in advance. Correspondence courses involving regular mail-back assignments have been used extensively for credit classes in the College of Arts and Sciences. The following have overseen correspondence courses: M. Timlin (1929-1946); D.D. Cameron (1946-1966); C. King (1966-1978); W.B. Whale (1978-1988); B. Cram (1988- ).