... Myriad empirical studies have shown that effective scaffolding practices promote cognitive development (e.g., Wood, Wood, and Middleton, 1978;Rogoff and Gardner, 1984;Pratt et al., 1988;Henderson, 1990;Diaz, Neal, and Vachio, 1991), language development (e.g., Bruner, 1983;Lucariello, 1990;Schrader, 1990;Fivush, 1991), and social development (e.g., Vandell and Wilson, 1987;Denham et al., 1995). Scaffolding practices have been found to promote development in infancy (e.g., Ratner and Bruner, 1978;Hodnapp, Goldfield, and Boyatzis, 1984;Ross and Lollis, 1987;Turkheimer, Bakeman, and Adamson, 1989) as well as in the older child (e.g., Pratt et al., 1992). ...