Developing a complex hypermedia application is a team-based process, involving a variety of "actors"analysts, domain experts, graphic designers, irnplernentors. The quality and cost-effectiveness of the final product is largely dependent on the ability of planning the overall development phases and of coordinating the effort of team members in an efficient way. In this paper, we will present our experience in the "Polyptych" project where we built a large hypermedia application for the Poldi Pezzoli Museum in Milano. We will discuss how we structured the activities of the development process, pointing out some novel aspects of our approach