The Overton window: A model of policy change

The Overton window, named after Joe Overton, is a model of policy change that explains how ideas that may seem impossible today can become policies in the future. The concept of the Overton window is based on a sliding aperture where policies above and below the window are not visible. By shifting the window, different policies come into view, making previously unthinkable ideas become possible. Think tanks play a crucial role in shifting the Overton window by developing and debating politically impossible ideas, with the aim of turning them into popular policies. It is important to note that the Overton window itself is value-neutral, meaning it can open for both good and bad ideas.