Discusses the effect of object-oriented programming on the evolution of authoring systems. Topics include the definition of an object; examples of object-oriented authoring interfaces; what object-orientation means to an instructional developer; how object orientation increases productivity and enhances interactivity; and the future of courseware…

Describes a two-year Canadian project devoted to the development and formative evaluation of a graduated series of four graphics-based programing environments for young children, called pre-Logo Microworlds. Field tests of software and instructional materials are described, and classroom observations and teacher and student interviews are…