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Rolf V. Olsen & Sigrid Blömeke In an earlier blog, we established that international large-scale assessments can be regarded as powerful and influential knowledge sources for making claims about the quality of educational systems. Comparisons between countries have over time...

Álvaro Choi Evaluating the effects of specific country / regional policies using large scale international assessments is a challenging task. This is primarily because this is not actually what they have been designed for. However, the rich data contained within...

Marc Piopiunik The OECD’s Programme for International Student Assessment (PISA) continually illustrates how the reading, science and mathematics performance of 15-year-olds differs across countries. Differences in teacher quality are commonly cited as a key determinant of these huge differences. In...