Abstract
This report contains an evaluation of the literature dealing with the formal components of route guidance systems that could function optimally from a user's point of view. A distinction must be made between: A) route planning, that is, the generation of alternative routes and the selection of one among them; B) the development of the resulting pattern of expectancies; C0 route guidance proper (during a trip). Only incidentally does the literature present significant information on these aspects of route planning and guidance. Hardly ever is there a systematic body of psychological knowledge of these processes. There fore the report concludes with recommendations for empirical research thatcould fill the gaps identified in the literature.