In 1973, two social scientists, Horst Rittel and Melvin Webber, defined a class of problems they called "wicked problems." Wicked problems are messy, ill-defined, more complex than we fully grasp, and open to multiple interpretations based on one's point of view. They are problems such as poverty, obesity, where to put a new highway—or how to make sure that people have adequate health care. They are the opposite of "tame problems," which can be crisply defined, completely understood, and fixed through technical solutions. Tame problems are not necessarily simple—they include putting a man on the moon or devising a cure for diabetes. They are, however, solvable. Solutions to tame problems either work or they don't.