google's quality raters guidelines, December 2019 updates
The updates add guidelines on content expertise and interstitial pages, while lumping “E-A-T” in with “Page Quality.

These refreshed guidelines from 2018 provide further information regarding interstitial pages and content creator expertise.
They also, in some areas, combine “E-A-T” (Expertise, Authoritativeness, Trustworthiness) and “Page Quality”.

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