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Social Web content such as blogs, videos and other user-generated content present a vast source of rich "digital-traces" of individuals' experiences. The use of digital traces to provide insight into human behavior remains underdeveloped. Recently, ontological approaches have been exploited for tagging and linking digital traces, with progress made in ontology models for well-defined domains.However, the process of conceptualization for ill-defined domains remains challenging; requiring interdisciplinary efforts to understand the main aspects and capture them in a computer processable form. The primary contribution of this paper is a theory driven approach to ontology development that supports semantic augmentation of digital traces. Specifically we argue that (1) activity theory can be used to develop more insightful conceptual models of ill-defined activities; which (2) can be used to inform the development of an ontology; and, (3) that this ontology can be used to guide the semantic augmentation of digital traces for making sense of phenomena. A case study on interpersonal communication is chosen to illustrate the applicability of the proposed multidisciplinary approach. The benefits of the approach are illustrated through an example application, demonstrating how it may be used to assemble and make sense of digital traces.

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Over the last two decades the use of Activity Theory has grown within the field of information studies. However, while there is a budding community, the use and development of Activity Theory in information studies remains underdeveloped and fragmented. This community building workshop provides an opportunity to: (1) introduce information scholars to the basic conceptual premises of Activity Theory focusing on the use, development and contribution of Activity Theory; (2) provide a forum to extend the development of Activity Theory; and (3) It will also provide a networking opportunity for scholars already utilizing Activity Theory and an opportunity to discuss the contributions iSchool scholars can make to the wider Activity Theory community.