Creating cities which are liveable and prosperous for all people is the goal of an international meeting which begins in Medellin, Colombia on Saturday.

The bi-annual World Urban Forum (WUF) convened by the United Nations Human Settlements Programme (UN-Habitat) examines the most pressing issues facing the planet due to rapid urbanization.

Delegates from across the world are focussing on the interface between cities and the elaboration of the Post-2015 Development Agenda.

Joan Clos, the Executive Director of UN-Habitat is in Medellin for the forum.

Daniel Dickinson has been speaking to him and began by asking him what makes a good city.

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