PARIS - The Organization for Economic Cooperation and Development (OECD), whose global ranking of schooling levels has become a reliable source of national pride and shame, has now set out to measure how different countries in the developed world stack up in adult skills.

(Read this piece by OECD's Andreas Schleicher, who has spearheaded both the education and adult skills studies)

The OECD tested some 157,000 adults in 24 education systems, representing populations of 724 million people, to study the levels of literacy, numeracy and digital skills. The target population for the survey were adults aged 16-65, living in the country at the time of data collection, irrespective of nationality, citizenship or language status. 

Take a MONDO tour of some key findings and national rankings, according to literacy and numeracy.