Chapter 2 provides background on the WPS Agenda and UN mediation. It first discusses the politics of the WPS Agenda in the UN by focusing on three main dynamics: how UN actors articulate what the WPS Agenda is, how the UN's mediation architecture has adopted the Agenda, and how actors within the UN resist the Agenda, both passively and actively. It then provides an overview of the UN's mediation role and how it is institutionalised. The chapter illustrates the different forms UN mediation can take by describing three processes that come up throughout the book: the Great Lakes of Africa (which deals with the national and regional dimensions of the conflict in the DR Congo), Syria, and Yemen. This chapter is especially useful for readers who may not be familiar with the WPS Agenda in the UN system and/or UN mediation.