The following organizations have supplied their most currently available statistical data for the World Competitiveness Yearbook. This has enabled us to provide the most up-to-date and accurate data for the 2011 edition of the WCY. We would like to thank them for their generous cooperation and their kind permission to reproduce their statistical material.

• CB Richard Ellis, Zürich, Switzerland
• CC & T (Corporate Consulting & Technology), Geneva, Switzerland
• Computer Industry Almanac Inc., Arlington Heights, USA
• Educational Testing Service (The TOEFL® Test), Princeton, USA
• Euromoney Institutional Investor PLC, London, UK
• Euromonitor, London, UK
• Institutional Investor, Inc., New York, USA
• International Civil Aviation Organization, Montreal, Canada
• International Energy Agency, Paris, France
• International Telecommunication Union, Geneva, Switzerland
• International Union of Railways, Paris, France
• Mercer Human Resource Consulting, Geneva, Switzerland
• National Science Foundation, Arlington, USA
• OECD, Environmental Data, Paris, France
• OECD, Economics Department Analytical Database, Paris, France
• PricewaterhouseCoopers, Lausanne and Basel, Switzerland
• Standard & Poor’s, New York, USA
• The Nobel Foundation, Stockholm, Sweden
• UNESCO Institute of Statistics, Montreal, Canada 
• Union Bank of Switzerland, Economic Research Department, Zurich, Switzerland
• World Bank, Development Data Group, Washington, USA
• World Intellectual Property, WIPO Statistics Database, Geneva, Switzerland
• World Tourism Organization, Madrid, Spain
• World Trade Organization, Geneva, Switzerland
• World Wide Fund for Nature, Gland, Switzerland