Survey of Adult Skills (PIAAC)

The Programme for the International Assessment of Adult Competencies (PIAAC) developed and conducts the Survey of Adult Skills. The survey measures adults’ proficiency in key information-processing skills - literacy, numeracy and problem solving in technology-rich environments - and gathers information and data on how adults use their skills at home, at work and in the wider community.


About the Survey of Adult Skills

This international survey is conducted in over 40 countries and measures the key cognitive and workplace skills needed for individuals to participate in society and for economies to prosper.

Learn more
 about how we measure and collect data. 

En Español

Take the test

View the sample questions and questionnaire.

Take the full Education & Skills Online test which measures adult skills in literacy, numeracy and problem solving in technology-rich environments.



Explore the full data sets and questionnaires.

Create an interactive data profile for your country.


PIAAC Log File Website

This website gives access to the log files from the PIAAC Study competency assessments on numeracy and problem solving in technology-rich environments.  These log files offer new opportunities to researchers, for instance to reproduce test-taking behaviour of individuals and to better understand test-taking behaviour.


Access the PIAAC Log file website

Country specific analysis

a selection of OECD country notes, national reports, and interactive country profiles.