The papers in this book are the result of the NATO conference "Cognitive Modelling and Inter active Environments" that was held in Mierlo, the Netherlands, November 5 - 8, 1990. Within the framework of the NATO Advanced Research Workshops this invitational conference was naturally on learning, but it emphasized a number of factors that are not generally treated in dis cussions on learning and specifically in computer-assisted learning. It was realized by the orig inators of the conference that, with respect to computer-assisted instruction, the stage has not nearly been reached where it is...