The Policy Research Working Paper Series disseminates the findings of work in progress to encourage the exchange of ideas about development issues. An objective of the series is to get the findings out quickly, even if the presentations are less than fully polished. The papers carry the names of the authors and should be cited accordingly. The findings, interpretations, and conclusions expressed in this paper are entirely those of the authors. They do not necessarily represent the views of the International Bank for Reconstruction and Development/World Bank and its affiliated organizations, or those of the Executive Directors of the World Bank or the governments they represent. Policy ReseaRch WoRking PaPeR 4391 Frustration with the performance of State-owned enterprises (SOEs) has led to two rounds of reform: the first round, from the 1960s through the 1980s, attempted to improve SOE performance while maintaining public ownership while the second, beginning in the late 1980s, viewed privatization as the answer. Interest in the earlier round of reform has increased recently as controversy has slowed or halted privatization in many countries, especially for SOEs providing infrastructure services that are basic to everyday life and are thought to have elements of monopoly. This paper reexamines the earlier This paper-product of the Sustainable Development Network-is part of a larger effort to renew our knowledge of how to improve the performance of infrastructure service providers, when full privatization is out of the realm of possibilities. The work program of SDN builds upon this framework, applying it at a sectoral and regional level and extending it to Public-Private Partnerships (PPPs). It aims at identifying the specific conditions under which each type of infrastructure reform can be expected to work, so better guidance can be provided to operational teams and clients.