Report of the working session of 30 August 2012 of the International Law Association study group on the conduct of hostilities under IHL in the 21st Century. Although the law of armed conflict has arguably already adapted in a certain way by providing special rules for non-international armed conflicts, one needs to keep in mind that especially the Hague Law dealing with the means and methods of warfare was mainly designed to deal with interstate wars. Even though some of these rules are nowadays held to be equally applicable to non-international armed conflicts, they were originally not drafted to cover the situation of these kinds of conflicts, and thus the fit is not always appropriate. What is more, in modern asymmetric conflict constellations the conduct of hostilities increasingly seems to intersect/coincide with law enforcement operations. Thus, the International Law Association study group was set up to examine whether the IHL rules governing the conduct of hostilities are still adequate to deal with current conflicts, or whether it needs revision or amendment.