1. Introduction Gregory F. Treverton and Wilhelm Agrell; Part I. Defining the Field, Its Theory, Historiography and Changes after the Cold War: 2. Building a theory of intelligence systems Michael Warner; 3. Reflections on intelligence historiography since 1939 Christopher Andrew; 4. A theory of intelligence and international politics Jennifer Sims; 5. Intelligence analysis after the Cold War - new paradigm or old anomalies? Wilhelm Agrell; Part II. Research on New Challenges, Methods and Threats: 6. On counterterrorism and intelligence Neal Pollard; 7. Technical collection in the post-9/11 world Jeffrey T. Richelson; Part III. Intelligence, Politics and Oversight: 8. The intelligence-policymaker relationship, and the politicization of intelligence Olav Riste; 9. Oversight of intelligence: a comparative approach Wolfgang Krieger; 10. The limits of avowal: secret intelligence in an age of public scrutiny Sir David Omand; 11. The science of intelligence: reflections on a field that never was Wilhelm Agrell and Gregory F. Treverton.