Quality rater guidelines

Google's public handbook for the people who rate search results to help it evaluate changes to its systems.

The Search Quality Rater Guidelines describe how raters should judge page quality and whether results meet a searcher's needs. Raters do not change rankings directly; their ratings measure whether Google's systems are working as intended. The document is the source of concepts such as E-E-A-T and YMYL, and Google updates it periodically.