Leonidas Kyriakides, Anastasia Panayiotou, Léan McMahon, Darko Zupanc, Gudrun Vanlaar, Katja Scharenberg, & Galini Rekalidou SYMPOSIUM “Establishing a knowledge-base for quality in education: Testing a dynamic theory of educational effectiveness” Paper 2 The impact of quantity and quality of teaching on student achievement International Congress for School Effectiveness and Improvement (ICSEI) 2013, Santiago, Chile, January 3-6