This document focuses on the principal aspects of urban ITS where vendor lock-in is recognized as a technical and financial problem: primarily centre-to-field communications and traffic management systems. It will cover the following scope: approaches to the management of MVEs by urban authorities, including mitigation and migration options; procedural and operational protocols to achieve interworking, using product/interface adaptation, translation products, replacement/reengineering, and other migration strategies; technical options for interworking multiple vendors' products; mechanisms to enable interoperability through automated translation between specifications, frameworks and product interfaces; review of principal approaches taken to date to implement these options in community frameworks and specifications.