Liberia and Sierra Leone are undergoing important transitions. The countries provide important case
studies on how the United Nations (UN) can ensure successful transitions, not only from peacekeeping to peace building but also from conflict to building a sustainable peace. With the current UN focus on conflict prevention for sustaining peace, this policy brief provides practical recommendations on what this means in practice. It examines what sustaining peace means in practice, and the implication this has for UN missions and their transitions. The analysis is derived from field research carried out from 15–24 November 2017 in Sierra Leone and Liberia.