National Center for Education Statistics: “Comparative Indicators of Education in the United States and Other G-20 Countries draws on the information about education from the International Indicators of Education Systems (INES) project at the Organization for Economic Cooperation and Development (OECD), as well as international assessments ranging across the lifespan from grade 4 through adulthood. Topics covered include population and school enrollment, academic performance, contexts for learning, expenditure for education, and educational attainment and income. The G-20 countries, which are among the most economically developed, represent 85 percent of the world’s economy and two-thirds of its population, and are some of the United States’ largest economic partners. This report is the latest in a series that has been published since 2002. Previous reports focused on the G-8 countries. This is the first to focus on the G-20 countries.”