The October 2012 issue of the Journal carried a Note by Daniel Bethlehem with the author’s proposal for a set of principles on the scope of a state’s right of self-defense against an imminent or actual armed attack by nonstate actors. The Editors’ Note to that item indicated that critiques of the proposal and other responses would be published in a subsequent issue of the Journal. Four such responses are presented here; the July 2013 issue will carry a continuation of the debate.