This Good Practice paper has been prepared to illustrate how the recommendations of the Civil Society Advisory Group on Aid Effectiveness can be put into practice.  It is based on 76 case studies, some of which are presented in the Paper.  The paper describes the different roles played by CSOs in the development process, including democratisation through civic engagement, social mobilisation and advocacy, public education and research, self-help and innovation and the provision of development assistance.  Its discusses recognition and voice (the importance of CSO participation in the development policy dialogue), and the contribution of civil society to enriching our understanding of the Paris principles.  It discusses the importance of an appropriate enabling environment for CSO effectiveness, and how CSOs themselves can be good donors – particularly in respect of the quality of partnerships between Northern and Southern NGOs.