“…Authors assigned some kinds of comments to students, then analyzed some later student measures (Allen, 1972;Cardelle & Como, 1981;Cardelle-Elawar, 1982;Cardelle-Elawar & Como, 1985;Hake, 1973;Hammer, 1972;Klinger, 1971;Krampen, 1987;Lesner, 1967;Mapel, 1970;Moody, 1970;Rhoads, 1968;Shrago, 1970;Simons, 1971;Starkey, 1971;Stewart, 1974;Stewart & White, 1976;Sweet, 1966).…”