panta rhei integrates narrative structures into arbitrary materials while at the same time facilitating readers to challenge, discuss, and assess the presented information on-the-fly. By managing the users' annotation in a threaded structure, users can then commonly discuss and answer questions. Furthermore, the system offers an assessment view on the content which allows users to e.g. assess the relevance or helpfulness of other users'entries. Based on semantic web technologies, i.e. webs-of-trust and virtual communities, panta rhei furthermore offers personalized rankings of user entries as well as adapted views on the content. In consequence, the system supports the social and emergent nature of collaborative knowledge acquisition and exchange but does also offer narrative structures to most easily explore and find information.