In the LICHEN project we propose to extend and complement the work of the UKERNA Wireless Advisory Group and TERENA TF-Mobility (which is establishing a RADIUS-based hierarchy of trust for Location Independent Networking) by investigating and developing a generic system for managing and applying authorisation policy pertaining to resources accessed by users in different administrative domains. These users would typically be members of short-lived, distributed collaborations between multi-site ââ¬â and often multi-disciplinary ââ¬â groups.