The constructivist research programme on international norms has demonstrated convincingly that, how, and why norms matter. Norms have been shown to constitute the identity of actors, to guide their behaviour into desired directions, and, altogether, to generate the normative basis of the international system. In the course of this intensive debate, its main concepts, such as the question of what constitutes a norm or different norm types, became fuzzy. Also, while the focus on the intended effects of norms certainly encompasses an essential part of the phenomenon, their unintended effects have been largely neglected. Motivated by these shortcomings, the article presents a new systematisation of effects of norms. The typology developed here discerns two types of intended effects, namely prohibitive and obligative effects, as well as two corresponding types of unintended effects, namely permissive and omissive effects.
