“…The metaanalysis described here synthesizes results from morphological interventions that have examined the effect of instruction both with participants identified with reading difficulties (e.g., Arnbak & Elbro, 2000;Tyler, Lewis, Haskill, & Tolbert, 2003) and spelling difficulties (e.g., Kirk & Gillon, 2009) and with undifferentiated participants (e.g., Baumann et al, 2002;Baumann et al, 2003;Bowers & Kirby, 2006, in press). We investigate results from instructional studies with age groups from preschool (e.g., Lyster, 1998Lyster, , 2002 to upper elementary (e.g., Robinson & Hesse, 1981) and across a variety of languages (English, Danish, Dutch, and Norwegian).…”