"If anyone doubted the importance of expertise in modern life, or the complexities of dealing with it, the current world circumstances will have changed their mind. Jamie Carlin Watson has provided a serious and highly accessible philosophical introduction to the literature on the topic, as well as providing his own synthetic view." -- Stephen Turner, Distinguished University Professor of Philosophy, University of South Florida, USA "Traditionally, the study of expertise could be represented by a Venn diagram with psychology and philosophy strongly overlapping. A third component, sociology, has more recently been added to the scheme. Jamie Carlin Watson is the first to embark on a survey of the whole terrain, approaching it critically from the point of view of a philosopher." -- Harry Collins, Distinguished Research Professor, Cardiff University, UK "Expertise is a multifaceted concept, requiring the subtle, multidisciplinary treatment that Watson offers in this book." -- Philip E. Tetlock, Annenberg University Chair, University of Pennsylvania, USA.