Describes a collection of systematic theory-based analyses of a system prototype that inherited its control mechanisms from preexisting systems. Demonstrates that collective use of system and user modeling techniques provides insight into a complex design problem, enabling the examination of design decisions for users and implementation. Discusses…

Individual papers discussing various facets of human relationships with interactive computer systems present an analysis of direct manipulation interfaces; discuss notion of conceptual models shared by system and user and propose a design methodology for delivering models to users; and address the intelligibility of systems and importance of…