\input zb-basic \input zb-ioport \iteman{io-port 06094688} \itemau{Diriye, Abdigani; Golovchinsky, Gene} \itemti{Querium: a session-based collaborative search system.} \itemso{Baeza-Yates, Ricardo (ed.) et al., Advances in information retrieval. 34th European conference on IR research, ECIR 2012, Barcelona, Spain, April 1--5, 2012. Proceedings. Berlin: Springer (ISBN 978-3-642-28996-5/pbk). Lecture Notes in Computer Science 7224, 583-584 (2012).} \itemab Summary: People's information-seeking can span multiple sessions, and can be collaborative in nature. Existing commercial offerings do not effectively support searchers to share, save, collaborate or revisit their information. In this demo paper we present Querium: a novel session-based collaborative search system that lets users search, share, resume and collaborate with other users. Querium provides a number of novel search features in a collaborative setting, including relevance feedback, query fusion, faceted search, and search histories. \itemrv{~} \itemcc{} \itemut{collaborative search; multi-session search; search interface} \itemli{doi:10.1007/978-3-642-28997-2\_72} \end