The increase in the world’s population over the next few decades will be mainly fuelled by the expansion of cities in developing countries. In 2007 - for the first time in human history - there were more people living in the world’s towns and cities than in the countryside . Today over three billion people live in cities or urban environments. The complex process that has led to this change is called urbanisation and has significant social, economic, environmental and cultural repercussions for society. As the fight against poverty is the main objective of development cooperation, it is only natural that development partners are paying special attention to support for sustainable urban development.