ERIK STAYTON Nissan Research Center – Silicon Valley; Massachusetts Institute of Technology MELISSA CEFKIN Nissan Research Center – Silicon Valley In this paper we explore the idea of a system of care through a city transit system. We argue that a systematic orientation to care is central to what makes a transit system work for people. Further, we suggest that this care orientation is recognized as such, even though it is not apparent in typical modes of systems management. Care is what knowing in this system is for. We examine how participants in the system navigate different epistemic bases of their work, focusing on how care work and information work intertwine. How is this work practiced and known? And how could we, as design researchers, use these practices to design systems of care? In service of these goals, we expand the notion of care work toward care of non-human actors as well as that of people. We focus particularly on the roles of automation and the risks automation presents for care. In a moment of increased...