“…There is general agreement in the literature (Hopkins, 1979;Murphy, 1957;Stemach & Williams, 1988) that a five-year-old youngster has a vocabulary of approximately 5,000 words or 2,500 word families (run, runs, running is one word family). Making the shift (at upper Grades 3-4, ages 8-9) from learning to read to reading to learn requires a critical mass of vocabulary of some 12,000-15,000 words (or about 8,000 word families), representing the child's oral vocabulary repertoire at age 8 (Biemiller, 2003;Biemiller & Slonim, 2001).…”