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The Research Data Centre PIAAC grants scientifically interested users access to the German and international data of the Programme for the Assessment of Adult Competencies (PIAAC). The first wave of PIAAC was conducted in 2011 and 2012, initiated by the OECD. The survey was based on a representative population sample. First, a computer assisted interview was conducted, which was followed by a competency assessment, usually performed on the computer.