As the world around them changed, schools did not. At least they did not change in the most important way they needed to change— how teachers teach. Instructional practices in schools have remained remarkably resistant to change. This is true worldwide. I have now trained teachers and observed classrooms in over twenty countries. Wherever I go, whether it is into schools in industrialized cities in wealthy countries, or rural towns and villages in poor countries, instructional strategies are remarkably similar. They are similar to each other and similar to what they were several hundred years ago.

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