More children than ever are in school, but are they receiving a quality education? According to the latest SDG 4 Data Digest by the UNESCO Institute for Statistics, about 617 million children and adolescents cannot read proficiently or do basic math, and two-thirds of them are sitting in a classroom. Are children gaining the skills they need for lifelong learning? The latest Digest presents how governments can measure learning outcomes using existing tools to produce internationally-comparable data. Data to change policies. Data to nurture learning.