“…The Atypical Brain Development (ABD) model originally was designed in response to perceived needs in the field of LD, and especially RD (e.g., Bonifacci, 2004;Davis, 2004;Fadjukoff, Ahonen, & Lyytinen, 2001;Frith, 2001;Gilger & Wilkins, 2008;Gilger & Wise, 2004;Goldstein & Schwebach, 2004;Jeffries & Everatt, 2004;Kaplan, Dewey, Crawford, & Wilson, 2001;Kreuger & Markon, 2006;Lyon, Fletcher, & Barnes, 2003;Lyytinen et al, 2000;Missiuna, Gaines, & Pollock, 2002;Ping & Zu-wen, 2005;Rice & Brooks, 2004;Sonuga-Barke, 2003;Valtonen, Ahonen, P. Lyytinen, & H. Lyytinen, 2004;Zoia, Barnett, Wilson, & Hill, 2006). The ABD concept evolved primarily from thinking about the ecological validity of diagnostic categories.…”