In this paper, we present results of a laboratory study inwhich participants completed an asynchronouscollaborative search task while thinking aloud. Based onanalysis of the think-aloud data and screen recordings, wepresent a set of collaborative search actions and rationalesthat our participants employed. For each, we describe thepurpose and motivations, and give illustrative examples.We also present three high-level strategies (independent,parallel, and divergent) that emerged from analysis ofparticipants’ verbalizations and discuss how participantsused these strategies as part of their overall search process.Our results show that collaborators’ prior work influencedsearch strategies and behaviors, and that participantsleveraged collaborators’ work at various stages of theinteraction including query formulation and resultsexamination. We discuss how the observed behaviorscomplement existing models of interactive informationseeking and suggest ways to extend current models.
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