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2. Teaching and Learning International Study (TALIS) (OECD) (2013)
3. Programme for International Student Assessment (PISA) (OECD) (2012)
4. Comisión Económica para America Latina (CEPAL) (2011)
5. What Is STEM Education?
http://www.livescience.com/43296-what-is-stem-education.html