“…Most of this research has examined the effects of various direct instructional approaches on vocabulary acquisition and certain related comprehension measures (Beck, Perfetti, & McKeown, 1982;Gipe, 1987-79;Jenkins, Pany, & Schreck, 1978;Lieberman, 1967;Mezynski, 1983;McKeown, Beck, Omanson, & Perfetti, 1983;MeKeown, Beck, Omanson, & Pople, 1985;Stahl, 1983;Stahl & Fairbanks, 1986). However, others have suggested that, because of the magnitude of the task, direct instruction can only account for a small proportion of vocabulary growth, and a substantial amount of lexical meanings must be acquired incidentally through exposure to natural written contexts (Nagy & Anderson, 1984;Nagy & Herman, 1984;Nagy, Herman, & Anderson, 1985). More recently, Nagy (Nagy, Anderson, & Herman, 1986, 1987 has attempted to determine middle-grade children's incidental learning of word meanings during reading to see if certain text properties influence this learning from context.…”