Book excerpt: What makes an expert? What strategies do they use? If you're an expert in one domain, are you more likely to become an expert in a second? In examining questions like these, Professor Fernand Gobet provides a comprehensive overview of the field of expertise. With research from a wide range of disciplines, including psychology, neuroscience, sociology, philosophy, education, law and artificial intelligence, this is the definitive guide to the subject. Understanding Expertise: A Multidisciplinary Approach - Considers expertise on a number of levels ranging from the neural to the psychological and the social; - Critically evaluates current theories and approaches; - Addresses issues of key importance for society, with implications for training methods and the development of artificial expert systems.