Co-Evolution of Users and Interactive Systems in the Web

This paper addresses the issue of co-evolution of users and systems in the web era and discusses an approach to designing web applications that support this co-evolution. The approach is illustrated through the design of a web portal for accessing, managing and annotating documents about the Valchiavenna territorial district, in Northern Italy. Users may perform End-User Development activities, so that the collaborative creation of knowledge and tailoring of tools to manage this knowledge are possible.