“…In the typical (or median) case, the experimental group required 4% more instructional time than did the control group. 1985Cabezon, 1984Clark, Guskey, & Benninga, 1983Dillashaw & Okey, 19831.16 Fehlen, 1976Guskey, Benninga, & Clark, 1984Honeycutt, 1974Hymel & Mathews, 1980Jones, Monsaas, & Katims, 1979Katims, Smith, Steele, & Wick, 1977Kersh, 1970Lewis, 1984Lueckmeyer & Chiappetta, 1981Martin & Srikameswaran, 1974Mevarech, 1980 1.04 Mevarech, 1986Myers, 1976 1.05 Okey, 1974Sheldon & Miller, 1973Slavin & Karweit, 1984Yeany, Dost, & Matthew, 1980 , White, 1974 Note. ES = effect size.…”