The vast majority of UK assistance for conflict, justice, security and stabilisation work is not delivered by HMG directly but is ‘outsourced’ to a range of delivery partners. Despite this significant trend in recent years, there has been a gap in HMG guidance for staff on issues to consider when outsourcing. This paper provides practical advice on how to increase the effectiveness of outsourced programmes. It focuses primarily on the use of outsourcing to implement interventions funded by the Conflict, Stability and Security Fund (CSSF) but also is relevant to other outsourced government programmes that address these issues, such as those supported by the Department for International Development (DFID). It provides readers with practical guidance on when to outsource programmes, how to design them and contract delivery partners and how to manage outsourced programmes.