This book is based on a 2004 conference organized jointly by the New America Foundation and the Center on Law and Security at New York University Law School, and it makes available the views of the 24 experts on al-Qaeda and terrorism – drawn from the worlds of academia, journalism, think tanks and the intelligence community – who met over one day to discuss al-Qaeda: what it is, how it is changed, and what policies can best deal with the threat emanating from it.