For other similar sounding scales, please see Richter scale or Ritter scale.

Richter's scale of cultures was a method of describing cultural achievement in use during the 23rd century.

Prior to learning their true nature in 2267, Federation experts rated the Organians at approximately class D minus on this scale; presumably, this corresponded to an agrarian culture with hand- or animal-powered machinery. (TOS: "Errand of Mercy")

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In the TOS novel Prime Directive, Doctor Alonzo Richter invented the Richter scale of culture in the early 2200s to monitor a civilization's progress.

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