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Saying it has an obligation to prepare students for a more global society, the University of Washington will require undergrads to complete a course in some area of diversity — economic, cultural or political — before they can graduate.

The new policy, initiated by a group of mostly minority students, followed three failed attempts over the past 22 years to introduce changes meant to ensure that all graduating students know a little more about other cultures and people who differ from them than they did when they first arrived.