2nd Cycle: Thirty-one countries participated in Round 1 of the Second Cycle of the Survey of Adult Skills (PIAAC). The data collection took place from September 2022 to August 2023.
1st Cycle: Thirty-nine countries participated in the First Cycle of the Survey of Adult Skills between 2011 and 2018, through three different rounds of data collection. Please consult the list of countries that took part in each of the Rounds and explore the results of the 1st Cycle.