Researchers at the University of Glasgow are beginning to look closely at data from the recently published Programme of International Assessment of Adult Competencies (PIAAC). Adults between 16 and 65 (in 2011/2012) in 24 countries were tested on their numerical, text understanding, and problem solving skills in technology-rich environments*.

What is new in this analysis is that they can see the exact development over age, and some very specific points of change (see figure below):

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