The report looks at knowledge dynamics in the teaching profession and investigates how teachers knowledge can be measured. It provides precious insights into 21st century demands on teacher knowledge.Highly qualified and competent teachers are fundamental for equitable and effective education systems. Teachers today are facing higher and more complex expectations to? help students reach their full potential and become valuable members of 21st century society. The nature and variety of these demands imply that teachers, more than ever before, must be professionals who make decisions based on a robust and updated knowledge base. This publication presents research and ideas from multiple perspectives on pedagogical knowledge - the knowledge of teaching and learning - and the changing nature of the teaching profession. It provides a modern account of teachers professional competence, and how this relates to student learning. The report looks at knowledge dynamics in the teaching profession and investigates how teachers knowledge can be measured. It provides precious insights into 21st century demands on teacher knowledge.The OECD is an international organization that consists of 30 Member countries from the developed world that accept the principles of representative democracy and free market economy. It originated in 1948 as the Organization for European Economic Cooperation (OEEC) to help administer the Marshall Plan for the reconstruction of Europe after World War II. Later its membership was extended to non-European states, and in 1961 it was reformed into the OECD. The organization provides a forum where governments can compare policy experiences, seek answers to common problems, identify good practice and co-ordinate domestic and international policies. With active relationships with some 70 other countries and economies, NGOs and civil society, the organization has a global reach. Renowned for its publications and statistics, its work covers economic and socilƒm