In this first MEDPRO project Policy Paper, author Nathalie Tocci considers the concept of sustainability and how it is central to any understanding of Mediterranean politics. Too often confused with stability in policy debates in the Mediterranean region and the West, Tocci argues that not only are these two concepts distinct, with sustainability being broader and deeper than stability, but stability, as interpreted with regard to the regimes in the region, has often run counter to the very conditions that underpin state sustainability.