To provide effective and enjoyable environments, designers and developers of the built environment must know and understand as much as possible about user expectations or requirements. Designers and developers must recognize clients' needs in order to be professionally effective and financially successful. Important in the design process is the study of human factors and the application of their principles and techniques. The humanistic critics of architecture also believe that people need to participate in the planning stages of their environment. Through participation, user needs and values can really be taken into account (Harrigan and Harrigan, 1976).