This collection examines the role of the just war tradition and its criteria in solving pressing present-day challenges. In particular, it deals with three types of challenges to world public order. One is anticipatory self-defense, in which one state attacks another to pre-empt or prevent an attack on itself, as the United States claimed in relation to Iraq in 2003. The second challenge is humanitarian intervention, in which one state attacks another to stop gross, large-scale violations of human rights, as NATO claimed to be doing on behalf of Kosovo in 1999. Both practices may erode world...