“…Researchers often refer to the age of the child in relation to other children in the same class as relative age (Aliprantis, 2010;Bedard & Dhuey, 2006;Deming & Dynarski, 2008;Dhuey & Lipscomb, 2008Dobkin & Ferreira, 2010;Elder & Lubotsky, 2009;Evans-Becker, 2003;Graue & DiPerna, 2000;Kern & Friedman, 2009;Puhani & Weber, 2007;Stipek, 2002;Weil, 2007;Yesil-Dagli, 2006;Zill, Loomis, & West, 1997). Large differences between the ages of same-grade students arise in countries and school districts that have a single annual intake window.…”