Redesign of human-computer interface for users of computerized information systems can make substantial difference in training time, performance speed, error rates, and user satisfaction. Information and computer scientists are using controlled psychologically oriented experimentation, and evaluations during system development and active use to…

The model presented identifies three basic needs which must be met in order to increase our understanding of the user interface in computerized information systems: empirical studies of users' attitudes; systematic summaries and critical analyses of these studies; and an interim set of guidelines for user interface design. (EJS)

The command language features of 11 on-line information retrieval systems are presented in terms of the functional needs of a searcher sitting at a terminal. Functional areas considered are: becoming familiar with the system, receiving help when in trouble, regulating usage, selecting a data base, formulating simple queries, expressing single…