Now, whose schools are really better (or weaker) than Germany's? A multiple testing approach

► International school comparisons statistically test for "significant" differences. ► These tests usually do not take the multiplicity of tests performed into account. ► This approach may overstate the differences between countries' schools. ► We use multiple testing techniques to control for this problem. ► Using PIRLS data, we find up to 30% fewer significantly different countries.