The United Nations' development co-operation has often been criticized in the past; many shortcomings can indeed be identified. However, efforts to overcome the existing problems have been stepped up. A key role in the reform of the UN in this area is played by the United Nations Development Programme (UNDP). This study is intended as a constructive contribution to the current debate on the reform of UN development co-operation. It analyses both the main weaknesses of UN development co-operation as a whole and the reforms that have so far been undertaken. On this basis it identifies the areas in which further efforts are needed if the UNDP is to become more effective.