How can we measure what makes a school system work? Andreas Schleicher walks us through the PISA test, a global measurement that ranks countries against one another -- then uses that same data to help schools improve. Where does New Zealand sit? Learn the single factor that makes some systems outperform others.
What makes a great school system? To find out, Andreas Schleicher administers a test to compare student performance around the world. Watch the TED talk here.
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