1 Introduction
Collaborative information systems (CISs) allow groups of users to communicate and cooperate over common tasks. They have long been called upon to support and coordinate activities related to the domain of “computer supported and cooperative work” [4], [16]. Recent breakthroughs in networking, storage, and ubiquitous computing have facilitated an explosion in the deployment of CIS across a wide range of environments. Beyond computational support, the adoption of CIS has been spurred on by the observation that such systems can increase organizational efficiency through streamlined workflows [3], shave administrative costs [15], assist innovation through brainstorming sessions [22], and facilitate social engagement [55]. On the Internet, for instance, the notion of CIS is typified in wikis, video conferencing, document sharing and editing, as well as dynamic bookmarking [19].