The issue of convergence is an ongoing debate. How the world trading systems (multilateral and regional trade arrangements) affect the speed of convergence of GDP per worker and total factor productivity (TFP) is an unaddressed issue in the literature. Hence, the objective of this paper is to examine the impact of multilateral and regional trading systems on the speed of convergence drawing sample from five ASEAN countries, over the 1976 to 2000.  Source: International Research Journal of Finance & Economics; 2006 Issue 5, p52-63, 12p. Authors: Onwuka, Kevin Odulukwe, Baharumshah Ahmad Zubaidi & Habibullah, Muzafar Shah.