Book excerpt: Success has been hard to attain in recent years in multilateral disarmament and arms control work. Political problems exist, but they are not the sole problem. Obstacles to progress can be the unintended consequences of past practice, or they can stem from the complex challenges those involved must deal with. Aspects of multilateral disarmament practice compound cognitive challenges that individuals face in managing their perceptions and interactions with others. While there is no way to ensure success in disarmament endeavours, multilateral practitioners can improve the chances by recognising and harnessing cognitive diversity, as humanitarian perspectives in disarmament processes have shown. This book discusses practical suggestions to help achieve this.