Abstract : Numerous examples have been cited of deficiencies in the user- computer interface on Navy computers, both ashore and aboard ship. The computer system designer often overlooks the user's perspective in his desire to provide the user with a system that is a faster and more powerful tool. In this document requirements of the personal computer user are identified and contrasted with computer designer perspectives towards the user. The user's psychological needs are described so that the design of the user-computer interface may be designed to accommodate them. Development of the user-computer interface is discussed in terms of the user's physical, perceptual, and conceptual contacts with the system. The ideals of system design--transparency and visibility to the user-- are described. Further research is suggested that will explore the characteristics of efficacious menu selection, develop a theory of the operator, determine the best locus of control for dialogue features, provide guidelines for improving system documentation, and improve user work station habitability.