'This is the most compelling defence of a 'thick' constructivist approach to social, political, legal and international theory since the classic works by Kratochwil himself and Nicholas Onuf in the 1980s - but it is much more than that. Complex, challenging, very demanding but immensely rewarding, Friedrich Kratochwil's account of Praxis illuminates all aspects of an approach to social life that focuses on action, norms and ideas. This is a book that demands to be read and reread, a genuine classic.' Chris Brown, Emeritus Professor of International Relations, London School of Economics and Political Science

'Friedrich Kratochwil displays a rare ability: to combine philosophy, international relations theory, and historical knowledge. By demonstrating how to apply the analytical tools of a practice account of law and politics to international relations, he invites the reader to take a thought-provoking tour d'horizon of international studies that summarizes a life-time of scholarship.' Christine Chwaszcza, University of Cologne

'This book is a true magisterial tour de force – the sort of masterful work that one can only produce after the profound intellectual labor of a decades-long career of rumination and reflection. Kratochwil is one of the original architects of what has became known as 'constructivism' in international studies, but in this book he reaches out both before and after that label and that school to engage in a philosophically subtle and conceptually powerful re-thinking of our field from the ground up. That revisioned ground - the common life we share, and the meaningful, intention actions we engage in - is less a 'contribution' to the field than its comprehensive rearrangement. Read this book as you would listen to a symphony, and let the experience change your entire way of worlding for the better.' Thaddeus Jackson, American University, Washington, DC