The Trends in International Mathematics and Science Study (TIMSS) provides reliable and timely data on the mathematics and science achievement of U.S. students compared to that of students in other countries. TIMSS data have been collected from students at grade 4 and 8 since 1995 every 4 years, generally. In addition, TIMSS data have been collected twice from students at grade 12 (in 1995 and 2008), which can be referred to as TIMSS Advanced. The next TIMSS data collection is in 2015 and will include students in grades 4, 8 and 12. Further information on TIMSS 2015 is provided here.
In the most recent administration of TIMSS (2011), more than 60 countries and other education systems, including the United States, participated in TIMSS at grade 4 and 8. More than 20,000 students in more than 1,000 schools across the United States took the assessment in spring 2011, joining almost 500,000 other students around the world who also took part in TIMSS.
More information about TIMSS and related resources, including the TIMSS International reports, TIMSS assessment frameworks, and international data files, are available at the TIMSS International site.