The 2005 edition of Education at a Glance: OECD Indicators provides a rich, comparable and up-to-date array of indicators on the performance of education systems. In doing so, it represents the consensus of professional thinking on how to measure the current state of education internationally. The indicators look at who participates in education, what is spent on it and how education systems operate, and at the results achieved. The latter includes indicators on a wide range of outcomes ranging from comparisons of student performance in key subject areas to the impact of education on earnings