The Rio scale was proposed in 2000 as a means of quantifying the significance of a SETI detection.[1][2] The scale was designed by Iván Almár and Jill Tarter to help tell policy-makers how likely, from 0 to 10, it is that an extraterrestrial radio signal has been produced by an intelligent civilization.[3]
The scale is inspired by the Torino scale, which is used to determine the impact risk associated with near-Earth objects. Just as the Torino scale takes into account how significant an object's impact on the planet would be, the Rio scale takes into account how much a public announcement of the discovery of extraterrestrial intelligence would probably impact society.
The IAA SETI Permanent Study Group officially adopted the Rio scale as a way of bringing perspective to claims of extraterrestrial intelligence (ETI) detection, and as an acknowledgement that even false ETI detections may have disastrous consequences.[4][5]
The scale was modified in 2011 to include a consideration of whether contact was achieved through an interstellar message or a physical extraterrestrial artifact, including all indications of intelligent extraterrestrial life such as technosignatures.[6] A 2.0 version of the scale was proposed in 2018.[3][7][8]
^"The Rio Scale" (PDF).
^Arbesman, Samuel. "Quantifying Alien Encounters: The Rio Scale". Wired. ISSN 1059-1028. Retrieved 2022-05-30.
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