“The Overton window, also known as the window of discourse, is the range of ideas the public will accept. It is used by media pundits. The term is derived from its originator, Joseph P. Overton (1960–2003), a former vice president of the Mackinac Center for Public Policy, who in his description of his window claimed that an idea’s political viability depends mainly on whether it falls within the window, rather than on politicians’ individual preferences. According to Overton’s description, his window includes a range of policies considered politically acceptable in the current climate of public opinion, which a politician can recommend without being considered too extreme to gain or keep public office.
Overton described a spectrum from “more free” to “less free” with regard to government intervention, oriented vertically on an axis, to avoid comparison with the left-right political spectrum. As the spectrum moves or expands, an idea at a given location may become more or less politically acceptable. Political commentator Joshua Treviño postulated that the degrees of acceptance of public ideas are roughly:
The Overton window is an approach to identifying which ideas define the domain of acceptability within a democracy’s possible governmental policies. Proponents of policies outside the window seek to persuade or educate the public in order to move and/or expand the window. Proponents of current policies, or similar ones, within the window seek to convince people that policies outside it should be deemed unacceptable.
After Overton’s death, others have examined the concept of adjusting the window by the deliberate promotion of ideas outside of it, or “outer fringe” ideas, with the intention of making less fringe ideas acceptable by comparison. The “door-in-the-face” technique of persuasion is similar.”