Preferential trading agreements : friend or foe? / L. Alan Winters -- Third country effects of regional trade agreements / Caroline Freund -- Contingent protection rules in regional trade agreements / Thomas J. Prusa and Robert Teh -- The limits of PTAs : WTO legal restrictions on the use of WTO-plus standards regulation in PTAs / Joel P. Trachtman -- EU and U.S. preferential trade agreements : deepening or widening of WTO commitments? / Henrik Horn, Petros C. Mavroidis and André Sapir -- Labour clauses in EU preferential trade agreements-an analysis of the Cotonou partnership agreement / Jeff Kenner -- Do PTAs actually increase parties' services trade? / Juan A. Marchetti -- A model article XXIV : are there realistic possibilities to improve it? / William J. Davey.