Filtering your search results by reading level is now built into Google search. To do this, just click on Advanced Search and then click on "Reading Level," this will then show the popup below.
The option "Annotate results with reading levels" inserts a gray text indicating what our reading-level grader thinks that web page is at. Note how the first two results are at very different levels of difficulty.
You can, of course, select just the reading level you'd like to see: Basic, Intermediate or Advanced.
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.
[tags]search results,search filters,web search,internet search[/tags]