San Marino scale

A zero to 10 scale which attempts to categorize the risk of communicating with extraterrestrial intelligence. It was proposed in 2005 by Iván Almár. In 2007 the IAA SETI Permanent Study Group adopted the San Marino scale, “as it now exists or may be modified in the future, as an accepted tool for analysis of transmissions from Earth.”

It has since been revised.

The scale is described at:

A San Marino scale calculator is online at:

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