A bstractThis article explores the relationship between justice and effectiveness in bilateral and multilateral arms control negotiations. A set of hypotheses, derived from earlier * We gratefully acknowledge financial support from Riksbankens Jubileumsfond (grant no. P09-0448U-E) for the work here presented, and the research assistance of Annkatrin Tritschoks, Lynn Wagner and Ariel Young. We also thank Harald Muller, Lloyd Jensen, Terry Hopmann, and the anonymous reviewers for very helpful suggestions. Thanks go to the University of Southern Queensland for their administrative assistance in facilitating the research. The authors are listed in alphabetical order and made equal contributions to the work presented in this article.