Requirement-driven approach to interoperable traveler support system specification

This research is part of the CyberRail project in which we aim to develop itinerary-based, location-sensitive traveler information services for intermodal travelers. This paper covers our approach in which top-down requirements analysis is used effectively to derive interoperable traveler support system specification together with some feedback from experimental system implementations. The derived system specification reflects the requirements of stakeholders for each mode of transportation, including but not restricting to rail and will be used as a reference model for system developers of various traveler support systems. We believe that by conforming to the common reference model, several alternative implementations of CyberRail will appear in the future that guarantee sufficient level of interoperability.