Why international comparisons of education should focus on both averages and equality

Each new round of the OECD’s global education survey leads to scrutiny of country rankings based on the average child’s performance, but the new Innocenti Report Card argues that equality in test scores is just as important as average standards. Yekaterina Chzhen and Gwyther Rees, lead authors of the report, illustrate this point in relation to the four nations of the UK.