This study is an independent review of the pilot phase of the UK Government’s International Citizen Service. The 18-month pilot programme supported young British citizens to contribute to development through international volunteering and generated knowledge to inform future youth volunteering programmes. Overall the assessment has found that the delivery of this ambitious pilot programme has been successful. Targets have been met and the ICS pilot programme has made progress towards its overall purpose of generating knowledge about youth volunteering and demonstrating the contribution that young British volunteers from a variety of development and poverty reduction. Learning has been generated in many areas, and best practice is gradually emerging although because it is the final stage, this is less evident in the later stages of the volunteer journey (Return Volunteer Action). The study looks at each area of desired impact and comments on the extent of achievement.