“…Of the 10 reports on CTD, there were 4 treatment packages that combined time delay with other instructional procedures (Dipipi, Jitendra, & Miller, 2001;Gardill & Browder, 1995;Morse & Schuster, 2000;Winterling, Gast, Wolery, & Farmer, 1992), and one comparison of CTD with the system of least prompts (Ault, Wolery, Gast, Doyle, & Eizenstat, 1988). Three of the twelve studies compared the effectiveness of the PTD procedure with other instructional procedures, including the system of least prompts strategy (Godby, Gast, & Wolery, 1987), a visual fading procedure (Matson, Sevin, Box, Francis, & Sevin, 1993), and the most-to-least instructional strategy (Heckaman, Alber, Hooper, & Heward, 1998).…”