“…The majority of designs have included phase change (e.g., ABAB, etc. ; Bostow & Geiger, 1976;Darch & Thorpe, 1977;Darveaux, 1984;Davies & White, 2000;Fishbein & Wasik, 1981;Gresham & Gresham, 1982;Hegerle, Kesecker, & Couch, 1979;Lutzker & White-Blackburn, 1979;Medland & Stachnik, 1972;Robertshaw & Hiebert, 1973;Saigh & Umar, 1983;Salend, Reynolds, & Coyle, 1989), multiple baseline (e.g., Johnson, Turner, & Konarski, 1978;Maloney & Hopkins, 1973;Patrick, Ward, & Crouch, 1998;Swain, Allard, & Holborn, 1982;Swiezy, Matson, & Box, 1992), or combinations of the two designs (e.g., Barrish et al, 1969;Grandy et al, 1973;Harris & Sherman, 1973). Thus, a wealth of research has been conducted on the GBG, using strong research designs.…”