The document discusses indicators of education systems and frameworks for measuring educational quality and performance across countries. It addresses the need to (1) understand policy objectives and context, (2) consider multiple domains and levels from individual learners to national systems, and (3) recognize indicators that provide policy-relevant insights while also being technically feasible and comparable cross-culturally. International assessments like PISA aim to meet these criteria by measuring student performance, highlighting disparities, and informing policy, but require balancing breadth, depth, and country-specific needs.