OECD Secretary-General reveals findings of latest PISA education survey Teenagers from four big Chinese regions outshone their contemporaries in Western nations in a keenly watched survey of education capabilities published Tuesday, which also showed no improvement trend in developed countries over the past two decades. Presenting the main findings, OECD Secretary-General Angel Gurria said there was no improvement trend in developed countries over the past two decades. The PISA survey is carried out every three years by the Paris-based Organisation for Economic Cooperation and Development (OECD), this time among its 37 member states and 42 partner countries and economies. IMAGES AND SOUNDBITES