The second edition of Social Accountability Guidebook for CSOs is a learning resource that is intended to support the building of a community of practice of social accountability practitioners, advocates, and champions in West Africa. This guidebook is an updated version of the first edition which was published in 2018. The Guidebook presents case studies of social accountability initiatives from the West African region, interspersed with definitions of terminologies related to the concept. It is intended to deepen understanding and foster appreciation of the concept of social accountability, its potential for strengthening accountability in the region, and the challenges that may be encountered in implementing social accountability initiatives in the West African Context. It is hoped that the Guidebook will serve as a catalyst for further development and tailoring of the concept of social accountability in West Africa, by CSOs, development practitioners, local and central government agencies, the donor community, and all others who are interested in advancing accountability in West Africa.