“…The latter works seem to confirm Briars and Siegler's affirmation that the process of differentiating essential and nonessential characteristics of counting starts at 3 years of age and does not end at 5 years. Thus, some authors have sought to extend this analysis to children in the primary grades (e.g., Geary, Bow-Thomas, & Yao, 1992;Geary, Hamson, & Hoard, 2000;Kamawar et al, 2010;LeFevre et al, 2006;Saxe, Becker, Sadeghpour, & Sicilian, 1989). Nevertheless, the data from these investigations are not conclusive.…”