International Political Theory (IPT) focuses on the point where two fields of study meet - International Relations and Political Theory. It takes from the former a central concern with the 'international' broadly defined; from the latter it takes a broadly normative identity. IPT studies the 'ought' questions that have been ignored or side-lined by the modern study of International Relations and the 'international' dimension that Political Theory has in the past neglected. A central proposition of IPT is that the 'domestic' and the 'international' cannot be treated as self-contained spheres, although this does not preclude states and the states-system from being regarded by some practitioners of IPT as central points of reference. This handbook provides an authoritative account of the issues, debates, and perspectives in the field.