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The Overton window is the range of subjects and arguments politically acceptable to the mainstream population at a given time. It is also known as the window of discourse. The key to the concept is that the window changes over time; it can shift, or shrink or expand. It exemplifies "the slow evolution of societal values and norms".
The term is named after the American policy analyst and former senior vice president at Mackinac Center for Public Policy, Joseph Overton, who proposed that the political viability of an idea depends mainly on whether it falls within an acceptability range, rather than on the individual preferences of politicians using the term or concept. According to Overton, the window frames the range of policies that a politician may recommend without appearing too extreme, in order to gain or keep public office given the climate of public opinion at that particular time.
The political commentator Joshua Treviño has postulated that the six degrees of acceptance of public ideas are roughly:
The Overton window is an approach to identifying the ideas that define the spectrum of acceptability of governmental policies. The premise of the concept Overton defined was that politicians typically act freely only within a window seen as acceptable. Shifting the Overton window would involve proponents of policies outside the window persuading the public to expand the window while proponents of current policies, or similar ones within the window, attempt to convince people that policies outside the status quo should be deemed unacceptable. According to Lehman, who coined the term:
According to Lehman, the concept is just a description of how ideas work, not about advocacy of extreme policy proposals. In an interview with The New York Times, he said:
Use of the shifting scale concept has been adopted as relevant in broader areas and one may find references to an Overton window applied regarding shifting acceptability in fields without political policy implications.
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