This paper identifies three challenge problems for sensemaking: focusing on information in three tiers: core interests, information frontiers, and new subject areas. In addressing the challenges we take a fresh look at the old idea of indexes, recasting them as computational, trainable, social, and interconnected. The new social indexes leverage the activities and knowledge of information communities, helping sensemakers to find both answers and the "right questions."
Stefik, M. J. Social indexing. Sensemaking Workshop @ CHI 2008; 2008 April 6; Florence, Italy.