“…The most troublesome aspect of performance differences between the two learning methods has been that (a) superiority of the study-test method is distinctively large at times, but ( b ) is quite negligible on other occasions (cf. Eckert & Kanak, 1974;Estes, 1969;George, Le Taillanter & Poitrenaud, 1978; Ingison & Ekstrand, 1970;Izawa, 1972Izawa, -1980Izawa, Hayden & Isham, 1980;McCullers, 1971; Rowe & Paivio, 1972, Underwood, Schaughnessy & Zimmerman, 1972Winters, Attlee & Harvey, 1974; Winters & Goettler, 1973; for many earlier references see Izawa, 1972; Kanak, Cole & Eckert, 1972).…”