This thesis examines the participation of developing countries in the dispute settlement system of the WTO, and argues that they are in a disadvantageous position compared to their developed counterparts. The system's failure to effectively address or efficiently deal with this position is an evidence of its bias against and deficiency towards developing countries' participation. The thesis focuses on the problematic issues developing countries face throughout their use of the system. It also considers the role that the DSU has played in addressing these issues and the efficiency of that role in restraining and limiting their effect on developing countries' participation in the system. The thesis analyses some ideas on the reform of the DSU that have been proposed through WTO negotiations or literature, and discusses their applicability on the current dispute settlement system. Finally, the thesis employs these proposals along with its discussion on the subject to introduce a reformed model of the DSU which is more sensitive to developing countries' concerns in the system in order to help providing an understanding of how such modifications could be carried out in future reforms on the DSU.