“…This process resulted in the selection of parents and children from thirty-three research projects in the CHILDES archive: the British projects Howe (1981), Korman (1984), Theakston, Lieven, Pine, and Rowland (2001), Wells (1981), and Wilson and Henry (1998), and the North American projects Bates, Bretherton, and Snyder (1988; and see also Carlson-Luden, 1979), Bellinger and Gleason (1982), Bernstein (1982; and see also Bernstein-Ratner, 1984), Bliss (1988), Bloom (1970, 1973), Brent and Siskind (2001), Brown (1973), Clark (1978), Demetras (1989a, 1989b), Feldman (1998), Hayes (2000), Higginson (1985), Kuczaj (1976), McMillan (unpublished; see description in MacWhinney, 2000), MacWhinney (2000), Morisset (1991), Post (1992), Rollins (2003), Sachs (1983), Snow et al (1996), Suppes (1974), Tardif, Gelman, and Xu (1999), Valian (1991), Van Houten (1986), Warren-Leubecker (1982; and see also Warren-Leubecker & Bohannon, 1984), and Wilson and Peters (1988). From these projects, we selected the observational studies of 471 different parent–child dyads involving a target child of the correct age range, namely, below 3;6.…”