Pedestrian urban spaces are, and have traditionally been analyzed from an historical, cultural, and physical point of view. Information from the various fields dealing with this area of the physical environment is extensive in depth and scope. However, the problem that confronts the designer is not one of a lack of descriptive information about pedestrian urban spaces, but the lack of a specific type of quantitative and qualitative information that can be used to evaluate a physical environment. In addition, the need exists to establish a technique in the form of a useful tool to aid the architect in designing successful pedestrian urban spaces. Viewing the above as a primary concern, this thesis has addressed itself to consideration of two major areas: First, the establishment of a framework for describing pedestrian urban spaces. This framework is in the form of a descriptive vocabulary defining pedestrian urban spaces according to their archetypes, physical elements, and physical attributes. Second, the presentation of an interdisciplinary framework. This is the Intersystem Congruence Model, which draws together in a compatible arrangement the diverse analytical and design methodologies employed by the disciplines of Behavioral Science and Architecture. This approach, if applied to the task of evaluating pedestrian urban spaces would give the designer an opportunity to set up and investigate many more alternative solutions than is now possible. In so doing, it requires a deeper understanding of the problem, presents a logical approach for evaluation, and offers a basis from which the architect can objectively argue his conclusion.