“…Learning from worked-out examples is an important source of learning (VanLehn, 1986(VanLehn, , 1996, and it is a learning mode preferred by novices (e.g., Anderson, Farell, 8z Sauers, 1984;LeFevre & Dixon, 1986;Pirolli & Anderson, 1985;Reeker & Pirolli, 1995). Furthermore, research has shown that learning from worked-out examples is typically very effective (e.g., Sweller & Cooper, 1985;Tarmizi & Sweller, 1988;Ward & Sweller, 1990;Zhu & Simon, 1987). However, in order to successfully learn from these types of examples, the learner has to actively explain the solution steps to himself or herself because not all the information about the rationale of the solution steps, that is necessary for understanding the solution procedure, is included in the examples (cf.…”