Despite these positive trends, the real impact of the NGO sector is not well documented. This is partly because NGO performance-assessment and accountability methods are weak, and partly because NGOs are caught up increasingly in the world of official aid, which pushes them towards certain forms of evaluation at the expense of others. This unique book takes a hard and critical look at these issues, and describes how NGOs can, and must, improve the way they measure and account for their performance if they are to be truly effective.