Sector budget support is an aid modality which donor agencies are increasingly using to support African countries to achieve their policy objectives.  This literature review sets out to summarise the available published literature on the operation of Sector Budget Support (SBS),. In particular, it aims to develop a typology of SBS characterising different approaches in operation.  It forms part of a broader study commissioned by the Strategic Partnership with Africa Task Team on Sector Budget Support (SBS) which covers ten sector case studies from six different countries.