... The positive effects of teacher praise have been known for a long time (Gilchrist, 1916;Hall, Lund, & Jackson, 1968;Hughes, 1973;Madsen, Becker, & Thomas, 1968;McAllister, Stachowiak, Baer, & Conderman, 1969;Zimmerman & Zimmerman, 1962). Recent research has shown the positive effects of contingent praise on the behavior of infants (e.g., Poulson & Kymissis, 1988); preschoolers (e.g., Connell, Randall, Wilson, Lutz, & Lamb, 1993;Fox, Shores, Lindeman, & Strain, 1986); elementary school students (e.g., Martens, Lochner, & Kelly, 1992;McGee, Krantz, Mason, & Me-Clannahan, 1983;Mudre & McCormick, 1989;van der Mars, 1989); adolescents (e.g., Martella, Marchand-Martella, Young, & MacFarlane, 1995;Staub, 1990;Wolery, Cybriwski, Gast, & Boyle-Cast, 1991); and adults (e.g., Haseltine & Mittenburger, 1990). ...