This report, the second in an annual series in which the Humanitarian Policy Group (HPG) reviews key trends in humanitarian policy, focuses on the implications for humanitarian action of the global ‘war on terrorism’. As in the previous year’s study, commissioned specialists provide personal reflections on specific themes, reported in full in subsequent chapters: - the legal implications of 9/11, by Chaloka Beyani; - the implications of 9/11 for humanitarian NGOs, by Abby Stoddard; - humanitarianism and Islam, by Jonathan Benthall; and - Afghanistan after 9/11, by Chris Johnson.