“…A main point in this model is that representational change remains limited as long as the sequential constraint is in effect. Karmiloff-Smith's (1992) influential model, which tackles the general question of cognitive development and its possible application to drawing, gave rise to a large number of studies on children's graphic innovation abilities (Barlow, Jolley, White, & Galbraith, 2003;Berti & Freeman, 1997;Phillips, Halford, & Wilson, 1998;Picard & Vinter, 1999;Spensley & Taylor, 1999;Vinter & Picard, 1996;Zhi, Thomas, & Robinson, 1997). As a whole, these studies showed that (1) the constraint of independence between routines suggested by Karmiloff-Smith can indeed account for increasing representational changes with age, although sensitivity to verbal drawing instructions is thought to play a role, (2) the constraint of sequentiality within routines is not as strong as it was assumed to be, although the experimental findings lead to different conclusions on this issue, and (3) the role of a sequential constraint on representational change is not as clear-cut as predicted.…”