Google’s Gary Illyes cleared up one thing that SEOs have been possibly confused about for some time. There is not single score for EAT. There is not EAT score. EAT is not a real thing at Google. EAT is made up of many many algorithms, baby algorithms, that are made up of in the Google core algorithm.

Google does not give you a score for your site on how well the site does EAT. In fact, there are probably multiple algorithms for each letter in EAT. Expertise, authoritativeness and trustworthiness. Each alone probably have numerous algorithms that determine various signals to measure how authoritative a site might be based on who knows, PageRank, citations, the content accuracy (see what I did there) and more.

Here are the tweets covering when Gary Illyes said this on stage at PubCon:

But yes, you can do things to improve your EAT (not literally EAT) but you can do things to improve your site that signal to Google improvements in the concept of EAT:

Also from Marie Haynes blog:

My take is that Google does want us, webmasters, to focus on EAT because it makes for an overall better web site. Improving your EAT on your site should signal to Google through other means that your YMYL site should rank better for specific terms. But a site is not assigned an EAT score, like it might be given a Panda score back in the day.

Forum discussion at Twitter.