The Role of Guidance in Computer-Based Problem Solving for the Development of Concepts of Logic.

Describes a study at the University of Twente (Netherlands) that investigated the effect of two instructional variables, manipulation of objects and guidance, in learning to use the logical connective, conditional with a computer-based learning environment, Tarski's World, designed to teach first-order logic. Discusses results of pretests-posttests and retention tests. (Author/LRW)