Algorithmic Mediation for Collaborative Exploratory Search.


We describe a new approach to information retrieval: algorithmic mediation for intentional, synchronous collabo-
rative exploratory search. Using our system, two or more
users with a common information need search together, simultaneously. The collaborative system provides tools, user
interfaces and, most importantly, algorithmically-mediated
retrieval to focus, enhance and augment the team’s search
and communication activities. Collaborative search outperformed post hoc merging of similarly instrumented single
user runs. Algorithmic mediation improved both collaborative search (allowing a team of searchers to nd relevant in-
formation more efficiently and effectively), and exploratory
search (allowing the searchers to find relevant information
that cannot be found while working individually).