Transactive memory system (TMS) theory has been popularized in recent research on groups and other collectives. In this essay we outline current issues in TMS research and develop propositions that can be tested in future research. We describe issues concerning how researchers define and conceptualize TMSs, interpret the relationship between TMS measures and the TMS concept, and attend to the role of task type in TMS research. The potential to advance TMS research by incorporating multilevel and social network perspectives, reconsidering the role of information technology in supporting TMSs, and developing frameworks suited to complex, multiactivity tasks is considered.
