While budget analysis and advocacy activities have expanded dramatically in Africa, Asia, and Latin America over the past decade, no material has been systematically gathered on the impact of such work. Therefore, civil society groups interested in undertaking budget work have little access to the experiences of the pioneering organisations. This Briefing Paper summarises the findings of a study, led by the International Budget Project and the Institute of Development Studies at the University of Sussex, which attempts to fill this gap by bringing together evidence from case studies of organisations in Brazil, Croatia, India, Mexico, South Africa, and Uganda that have been engaged in budget work for at least five years.