An expert group meeting was convened to discuss case studies of regulatory inform of the urban informal sector in six developing country cities. This report (i) reviews regulatory factors constraining the development and operation of urban informal sector enterprises; (ii) examines innovative experiences regulatory reform in cities of three developing countries with large urban informal sectors; and (iii) identifies successful policies and develop policy guidelines for streamlining municipal regulation of the sector with a view to enhancing the income of the urban poor.