Introducing new concepts to learners in an order of increasing complexity appears to be beneficial for learning, but typically introduction of concepts does not always adhere to this principle. We examined whether introducing new algebra concepts in a contrasted manner or in an order of increasing complexity instead of a different more typical…

The general hypotheses derived from a series of six experiments in instructional theory were as follows: that the individually optimal reading sequence of juxtaposed, but mutally related, prose text depends on learning goal and pre-knowledge; that adult learners are able to approach this reading sequence through their own decisions; and that…