How to Evaluate Prototypes Supporting Opportunistic Meetings

For motorcyclists mobile opportunistic meetings are at the heart of their practice since they make biking more enjoyable. They use the meetings either to display their identity or to look at others. The bikers' opportunities to make such meetings possible and to make full use of them are constrained by high mobility. Therefore, we have invented the Hocman, which possesses the ability to supply appropriate identity during contingent meetings and increase awareness. It is a HTTP peer-to-peer application for handheld computers that enables sharing of HTML documents over ad-hoc networks. When evaluating our prototype we face a number of problems that has not been addressed when studying related concepts and practices. What is the appropriate fit between scope, setting and method, in order to get useful knowledge about support for mobile opportunistic meetings when people move through a vast area at very different occasions?