This book is a synthetic historiography of present-day international relations theory, a critical analysis of the continuing diversity and complexity of enduring themes through a sustained focus on the analysis of the empirical evidence accumulated by social scientists. Special attention is given to key historical changes in theoretical approaches over the past half-century with full recognition of the contestation over state-based theory, and the changing fortunes of contemporary approaches. The book suggests that viable theories must transcend current intellectual fashion, and attempts to...