“…Some interesting research into the question was carried out by a group of psychiatrists, psychologists, physicians, and psychotherapists of University College London Health Centre in the 1970s (Crown et al, 1973;Lucas and Crown, 1974;Lucas et al, 1976;Crown et al, 1977;Stringer et al, 1977Stringer et al, , 1978. They attempted to develop a systematic way of delineating and measuring study difficulty in the affective domain only, as contrasted with the cognitive.…”