Value-added estimates are a significant improvement upon measures of school performance currently used in most education systems across OECD countries. They provide a fundamentally more accurate and valuable quantitative basis for school improvement planning, policy development and for enacting...

This publication provides all the information required to understand the PISA 2003 educational performance database and perform analyses in accordance with the complex methodologies used to collect and process the data. It enables researchers to both reproduce the initial results and to...