A Navigational Aid for Blind Pedestrians Designed with User- and Activity-Centered Approaches

The two-fold aim of this chapter is to present the design process of an interface for a mobile navigational aid for blind pedestrians and a set of rules for producing route descriptions for these users, as well as the methodology used to develop them, rooted in a userand activity-centered approach. We first present the state of the art of wearable verbal navigational aids and what might still be lacking in their conception, and propose a reusable userand activity-centered approach designed to complement already existing and future systems. Case studies fitting into this approach are next presented: route descriptions produced by blind pedestrians were analyzed; the production rules were extracted and tested in urban areas. Results reveal these rules, the specific database features, the required user profiles, and the precision of localization necessary for assisting blind pedestrians’ wayfinding in urban areas. Finally, future trends in mobile guiding tools for the visually impaired are examined.