“…Thus, learning requires modifying internal schemata (i.e., structural knowledge), whereas CPS requires transforming some specific aspects of a problem solver's external environment in order to reach an externally represented goal state (i.e., instance knowledge). Wirth et al (2009) and Künsting, Wirth, and Paas (2011) showed that this goal specificity effect (internal vs. external goals) affected learning and complex problem solving performance mediated by strategy and cognitive load. From this, one could conclude that presenting well-defined goals will help separating CPS from learning, but Kröner et al (2005) argue that even when trying to reach a given and well-defined goal state problem solvers may yet learn important aspects of a problem's structure (i.e., structural knowledge), that is, they modify their internal schemata and not only their external environment.…”