Assesses the proficiency of adults from age 16 onwards in literacy, numeracy and problem solving in technology rich environments. The data collection took place from August 1, 2011 to March, 31 2012 in most participating countries. Around 166 000 adults, representing 724 million adults aged 16 to 65, were surveyed in 24 countries and sub-national regions in the official language/s of the countries.
