The experience of OECD countries shows that a special development agency could effectively address these complex issues. In the United Kingdom, Urban Development Corporations (UDCs) have been used as a mechanism to regenerate urban areas in need of revitalisation where there was a need for a new body that could take a focused, single-minded approach. While most UDCs have been created by central government, Mayoral Development Corporations (MDCs) and other forms of development corporations are recently used as delivery vehicles by local authorities (Box 2.21).