The OECD Directorate for Education and Skills is committed to its mission of providing valid, reliable and comparable data to the policy makers of OECD member countries and partner economies. With this objective in mind, the OECD’s requests for proposals elicit innovative designs and well-documented approaches. cApStAn has been commissioned for linguistic quality assurance in a number of large-scale OECD projects since their inception: PISA since 2000, PISA for Development, PIAAC since 2010, and TALIS since 2008, to name but a few.