Filter Searches byDate, Reading Level, LocationAfter entering your search word(s), clicking on "Search Tools" will revel these three areas:Under "Any Time", you can narrow your search by when the information was posted online:Under "All Results", you can choose the reading level:The reading-level is based primarily on statistical models we built with the help of teachers. We paid teachers to classify pages for different reading levels, and then took their classifications to build a model of the intrinsic complexity of the text. (...) We also used data from Google Scholar, since most of the articles in Scholar are considered advanced.
So the breakdown isn't grade- or age-specific, but reflects the judgments of teachers as to overall level of difficulty. Roughly speaking, "Basic" is elementary level texts, while "Intermediate" is anything above that level up to technical and scholarly articles, a la the articles you'd find in Scholar.
That's not exact, but it's a fairly robust model that works across a wide variety of different text styles and web pages.Once you click on "Reading Level", you'll be able to click on "Basic", "Intermediate" or "Advanced":Under (in this situation) "Argyle, TX", you can choose to filter by location: