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Ideas generally accepted by experts or the public

The conventional wisdom or received opinion is the body of ideas or explanations generally accepted by the public and/or by experts in a field. In religion, this is known as orthodoxy.

Conventional wisdom is not necessarily true. It is often seen as a hindrance to the acceptance of new information, and to the introduction of new theories and explanations, an obstacle that must be overcome by legitimate revisionism. That is, conventional wisdom has a property analogous to inertia that opposes the introduction of contrary belief, sometimes to the point of absurd denial of the new information or interpretation by persons strongly holding an outdated but conventional view. Since conventional wisdom is convenient, appealing, and deeply assumed by the public, this inertia can last even after many experts and/or opinion leaders have shifted to a new convention. Conventional wisdom may be political, being closely related to the phenomenon of talking points. The term is used pejoratively to suggest that consistently repeated statements become conventional wisdom whether they are true or not. More generally, it refers to accepted truth that almost no one seems to dispute, and so it is used as a gauge (or wellspring) of normative behavior or belief, even within a professional context. For example, the conventional wisdom in 1950, even among most doctors, was that smoking tobacco is not particularly harmful to one's health. The conventional wisdom today is that it is. More narrowly, the conventional wisdom in science and engineering once was that a man would suffer lethal injuries if he experienced more than eighteen g forces in an aerospace vehicle, but it is so no longer. (John Stapp repeatedly withstood far more in his research, peaking above 46 Gs in 1954.

Evidence based medicine is a deliberate effort to acknowledge expert opinion (conventional wisdom) and how it coexists with scientific data. Evidence based medicine acknowledges that expert opinion is "evidence" and plays a role to fill the "gap between the kind of knowledge generated by clinical research studies and the kind of knowledge necessary to make the best decision for individual patients."