Offers a seminal philosophical work, that presents a conception of knowledge which makes ethics, practical knowledge and non-mathematic parts of the social sciences just as much parts of 'knowledge' as the sciences themselves. 'Putnam is an engaging and tantalising thinker. The debates about scientism in the study of human beings will be given a new impetus by the appearance of this book ... the book will attain a positionwithin philosophy of social science which will make it required reading for every aspiring methodologist.'- TheTimes Higher Education Supplement