Human Factors in System Design, Development, and Testing describes engineering system design as a behavioral process, a process which raises questions the designer must answer. It focuses on the concepts underlying the design process, culminating in a behavioral theory of the design process. Special effort has been made to depict human factors design as it actually occurs. Particular attention is paid to users of the design products, with special emphasis on design for the elderly and handicapped. Written by one of the first leaders in human factors, this book features: *the use of a large scale survey of design specialists to determine how design issues and problems are dealt with in real life; *an analysis of the engineering design process as actually being based on cognitive behaviors; and *the development of a behavioral theory of design.