Invisible Agency is a sociological work in a specific medical domain, that of dialysis in Taiwan, that forms a set of local knowledge. The author has been in this field of study for more than two decades and continually prompts new theoretical reflections with his empirical observations. The book covers a wide range of issues and detailed information about users of dialysis technology, including both hemodialysis (HD) and peritoneal dialysis (PD), as well as their situations and environments. In this book, readers may witness how the invisible HD and PD community is made visible by the author's "translation" in the academic sense. Published by the Institute of Sociology, Academia Sinica, the leading organization in sociological research in Taiwan, Invisible Agency reflects the domestic sociological community's changing attitude toward actor-network theory (ANT), a theoretical framework previously not widely accepted by Taiwanese sociologists.