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About - International Studies

The following table lists the comparative international studies that the United States participates in currently (ordered by the target age groups). It identifies the domains surveyed by each study and the years they have been conducted.

Study What's Surveyed? Who's Surveyed? When?
International Early Learning Study (IELS)
International Early Learning Study (IELS)
  • Emerging literacy skills
  • Emerging numeracy skills
  • Empathy & trust
  • Self-regulation
5-year-olds 2018
Progress in International Reading Literacy Study (PIRLS)
Progress in International Reading Literacy Study (PIRLS) logo
  • Informational and literary reading literacy
  • Online reading literacy
4th-graders 2001, 2006, 2011, 2016, 2021
Trends in International Mathematics and Science Study (TIMSS)
Trends in International Mathematics and Science Study (TIMSS)
  • Mathematics
  • Science
4th-graders
8th-graders
1995, 1999, 2003, 2007, 2011, 2015, 2019
  • Advanced mathematics
  • Physics
Advanced 12th-graders 1995, 20081, 2015
International Computer and Information Literacy Study (ICILS)
International Computer and Information Literacy Study
  • Computer and information literacy
8th-graders 20131, 2018
Program for International Student Assessment (PISA)
Program for International Student Assessment (PISA) logo
  • Reading literacy
  • Mathematics literacy
  • Science literacy
  • Problem solving
  • Financial literacy
15-year-olds 2000, 2003, 2006, 2009, 2012, 2015, 2018
Teaching and Learning International Survey (TALIS)
Teaching and Learning International Survey (TALIS) logo
  • Teachers' teaching practices, and learning environments
Teachers in grades 7, 8, and 9 20081, 2013, 2018
Program for the International Assessment of Adult Competencies (PIAAC)
Program for the International Assessment of Adult Competencies (PIAAC) logo
  • Literacy skills
  • Numeracy skills
  • Problem solving in technology-rich environments
Adults ages 16-65 (16-74 in the U.S.) 2012, 20142, 20172, 2021
1 The United States did not participate in this cycle.
2 The United States conducted an additional round of data collection between international cycles.

The following table lists past comparative international studies that the United States has participated in (ordered by the target age groups). It identifies the domains surveyed by each study and the years they were conducted.

Study What's Surveyed? Who's Surveyed? When?
Civic Education Study (CivEd)
Civic Education Study (CivEd) logo
  • Knowledge of democratic practices and institutions
  • National identity and international relations
  • Social cohesion and diversity
9th-graders 1999
International Adult Literacy Survey (IALS)
International Adult Literacy Survey (IALS) logo
  • Prose literacy
  • Document literacy
  • Quantitative literacy
Adults ages 16-65 1994
Trends in Mathematics and Science Study (TIMSS) Video Study
Trends in International Mathematics and Science Study (TIMSS)
  • 8th-grade mathematics and science teaching practices
Teachers of 8th-grade mathematics and science 1995, 1999
Adult Literacy and Lifeskills Survey (ALL)
Adult Literacy and Lifeskills Survey (ALL) logo
  • Prose and document literacy
  • Numeracy
  • Analytical Reasoning/problem solving
Adults ages 16-65 2003