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Plug a school name into any Internet search engine, and within a few pages, you鈥檙e likely to come across the GreatSchools website.

GreatSchools.org neatly ranks more than 136,000 traditional public, private, and charter schools nationwide on a scale of 1 to 10, based on state test scores. But what often draws readers are the gossipy insider comments posted by parents, students, and teachers, and the star ratings those commenters contribute.

The growth of online school rating services has gone hand in hand with the growth of the school choice movement: Parents need independent information on the array of educational options opening up to them. And the San Francisco-based nonprofit GreatSchools has garnered long-running support from philanthropies that back such school choice measures as charter schools and private school vouchers.

GreatSchools.org is not the only website that ranks pre-K-12 schools. The Internet search engines Yelp and Google offer school ratings, as do websites such as Schooldigger.com and Privateschoolreview.com. But with 40 million annual unique visitors, GreatSchools is the one most used, according to Alexa Internet, which tracks Web traffic.

The site鈥檚 founder and chief executive officer, Bill Jackson, says GreatSchools wants to be more than just a school ratings site: He sees it developing into an association that serves parents in the same way that the AARP serves retirees, or that AAA represents drivers.

鈥淲e see ourselves offering incentives, discounts on products, and services that will support parents toward preparing a high school graduate.鈥� Mr. Jackson said.

But that kind of expansion may worry some educators, who see the nonprofit organization鈥檚 ratings as too narrow to provide a fair and full picture of their schools. In response, the site is expanding its schools pages, allowing administrators to contribute videos, pictures, and other information.

New Platforms, Partners

Already, GreatSchools has expanded its reach beyond the Web, printing glossy guides to schools that go to parents in the District of Columbia, Indianapolis, and Milwaukee, all cities with extensive charter school programs. It has plans to expand its mobile-application presence, reaching millions of parents who may not have regular Internet access at home but can access the Web through smartphones.

In December, the U.S. Department of Housing and Urban Development announced a partnership with GreatSchools that will allow parents who live in public housing or receive housing vouchers to learn more about school options through GreatSchools resources. 鈥淭he partnership with GreatSchools is HUD鈥檚 opportunity to give families in our rental-assistance programs tools to find the very best educational opportunities for their children,鈥� Sandra B. Henriquez, HUD鈥檚 assistant secretary for public and Indian housing, said in an email.

That aspect of parent empowerment has drawn support from philanthropic organizations such as the New York City-based Robertson Foundation, which provided $1 million to GreatSchools in 2011.

鈥淭he reality for a parent making a decision about schools is that there鈥檚 an awful lot of word of mouth. One of the things GreatSchools does is give you independent data,鈥� said Phoebe C. Boyer, the foundation鈥檚 executive director.

Other backers include the WaltonFamily Foundation, which helps support 91制片厂视频 Week鈥檚 coverage of parent-empowerment issues, and the Joyce Foundation, which supports coverage of teacher-policy issues.

The site also has created Web-based teaching modules, called College Bound, for teaching parents how to navigate a conference with a teacher, or how to help with homework. Those modules are currently available through 20 district, charter, and nonprofit partners.

鈥楽kin in the Game鈥�

Parents, Mr. Jackson believes, are an 鈥渦nderappreciated鈥� part of a child鈥檚 educational success.

鈥淔amilies have the most skin in the game,鈥� he said. 鈥淭hey need to understand their role in helping their children.鈥�

GreatSchools was founded in 1997 as an independent rating system for schools in the Silicon Valley area of California. The site was one of several projects that Mr. Jackson, an Internet entrepreneur, worked on as a way to promote the nascent computer-networking industry.

A confluence of circumstances led to GreatSchools鈥� growth in the state, he said: the creation of a common testing system that allowed California schools to be compared with one another, the birth of charter schools in the state, and the spread of Internet technology that allowed information to be disseminated widely and quickly.

The site next expanded to Arizona with Texas, Florida, and Washington state soon following. The federal No Child Left Behind Act, with its emphasis on standardized testing as the gauge of schools鈥� progress, 鈥渨as really a huge boost鈥� to the site, Mr. Jackson said.

But the states didn鈥檛 always make that information easily obtainable, Mr. Jackson said, so GreatSchools tried to present it in an easy-to-comprehend manner.

By 2001, parents and others involved in a school could leave anonymous comments on the site, which draw more attention from school leaders than the rankings based on test scores, Mr. Jackson said. The site is closing in on nearly 1 million reviews and plans to expand its rating systems next year, inviting its anonymous commenters to go into more depth about benefits鈥攐r drawbacks鈥攐f a school that may be difficult to capture in a number ranking.

Under the protection of anonymity, commenters tend not to pull their punches. For example, this comment on the 4,000-student Adlai Stevenson High School in Lincolnshire, Ill., which rated 10 out of 10 points based on test scores and received five out five stars in its 鈥渃ommunity rating": 鈥淭his is a school meant only for superachievers,鈥� said one poster identified as a parent.

On the Web page for Pflugerville High School in suburban Austin, Texas, which has a 6 out of 10 rating for its test scores and an average of three out of five stars from its community members, one poster identified as a student praised the teachers, the administration, and counselors but had harsh words for his peers.

鈥淏eing a student, I have firsthand experience dealing with the kids who go here,鈥� he wrote, 鈥渁nd, to be quite blunt, a good amount of them are loud, annoying, and rude to not only teachers but also other students.鈥�

Assessing the Reviews

Attacks on teachers and drive-by insults are barred under the site鈥檚 terms of use, but GreatSchools relies on readers to flag inappropriate remarks for removal.

鈥淥ur philosophy on this is that we鈥檙e not expecting that any one review will provide the revealed truth about a school. The value is when you can read five or 10, preferably more than 10,鈥� Mr. Jackson said. 鈥淚f there鈥檚 one or two or three on a school, it鈥檚 difficult to know who鈥檚 writing that review.鈥�

But more reviews tend to reveal patterns, he said. 鈥淎s you read certain things,鈥� he said, 鈥渋t can prepare you to know what questions to ask if you choose that particular school for a visit.鈥�

Damon T. Murphy, the superintendent of the 6,500-student Canutillo Independent School District in suburban El Paso, Texas, said his school board voted this year to try to raise its GreatSchools profile at least one point from 5, where it had stalled for several years.

The vote came before he knew how GreatSchools creates its test scores. Though the star ratings are purely subjective and based on commenters, the numerical rating is based solely on test scores,which disappointed Mr. Murphy. But, he said that GreatSchools was receptive to his suggestions that more measures be incorporated into a school鈥檚 鈥済rade.鈥�

The district is drawing more middle-class families 鈥渢hat have more of a tendency to 鈥榮hop鈥� their child鈥檚 education,鈥� Mr. Murphy said.

School rating systems 鈥渁re a reality that school systems across the country will have to come to grips with,鈥� he added. 鈥淚f GreatSchools doesn鈥檛 do it, your local newspaper will.鈥�