Google’s Mimi Underwood said that “ratings from evaluators do not determine individual site rankings, but are used help us understand our experiments.” She added, “The evaluators base their ratings on guidelines we give them; the guidelines reflect what Google thinks search users want.”
Underwood implied Google will keep the document updated over time, as they are constantly refreshing it “as search, and how people use it, changes.”
User experience is a big factor when it comes to mobile websites, with smartphones labelled as “challenging to use, especially compared to a desktop computer or laptop”.
“Some web pages are difficult to use on a mobile phone. Website navigation can be difficult as menus and navigation links may be small. Web pages may require left-to-right scrolling to read text. Images may not fit on the screen. In addition, many mobile devices cannot access web pages with Flash or other similar features.”