This chapter discusses corruption within development programmers, as far as it concerns Danish International Development Agencies (DFID's) approach to anti-corruption strategies. It introduces the UK's approach to anti-corruption programming and also places it within the wider context of the UK's approach to international development. The chapter discusses the ability of a foreign government to deliver substantial change in all respects in a different country with a very different culture, history, institutional architecture as well as political and economic climate, through bilateral or multilateral initiatives. It highlights that it is important to work to improve the entire systems within which each institutions operates (for example, to work with the investigatory, prosecutory and judiciary institutions to improve the legal sanctions system; or with the media as well as with the state institutions that can guarantee protection for whistleblowers). The chapter considers the context of bilateral anti-corruption programming – politics, the existing evidence of what works, as well as the associated costs.