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At the Neighborhood School, a public elementary school in New York City鈥檚 East Village, students are creating and editing an online encyclopedia on pop-culture topics such as anime and X-Men.

Students at East Side Community High School a few miles away have written and shared their own versions of 鈥淢acbeth鈥� and discussed them online.

And at Lewis Elementary School in Portland, Ore., teachers can brainstorm and post their meeting notes on a Web site that allows instant access to revision and feedback.

All three schools are using 鈥渨ikis鈥濃�攄o-it-yourself Web sites that foster collaboration and communication. A wiki, short for wiki-wiki, or 鈥渜uick鈥� in Hawaiian, is a new technology tool of the Read/Write Web or Web 2.0鈥攖he second generation of Web applications that includes podcasts and blogs.

Wikis are still flying under most schools鈥� radar screens. And educators who use them must also deal with some privacy and security concerns. Still, education technology experts say wikis show promise for K-12 educators.

鈥淚t鈥檚 a really easy way to organize stuff,鈥� said Will Richardson, the supervisor of instructional technology and communications at Hunterdon Central Regional High School in Flemington, N.J., and the author of the just-published book, Blogs, Wikis, Podcasts, and Other Powerful Web Tools for Classrooms.

鈥淚t鈥檚 more collaborative than a blog鈥濃�攁 Web log, or online journal鈥斺�渁nd can be a pretty effective tool,鈥� he said.

Accessible Technology

A wiki, simply put, is a Web site that allows anyone to add or change content, anytime. Wikis are increasingly being used in the business world for tasks such as tracking projects, brainstorming, and writing and editing documents online, negating the need for back-and-forth e-mails and meetings.

Like other wikis, K-12 wikis let users add, edit, and delete content created by themselves or others. Users can also see a history of changes made to the original material. The only difference is that with many鈥攂ut not all鈥攕chool wikis, users must register before they can make changes.

鈥淚t鈥檚 a free-form, open-ended sort of tool,鈥� said Timothy Stahmer, an instructional technology specialist in the 163,500-student Fairfax County, Va., school system, where some teachers are experimenting with wikis. 鈥淚t鈥檚 just a matter of teaching people what that power is for.鈥�

The wiki concept was developed in 1995 by computer programmer and software consultant Howard G. 鈥淲ard鈥� Cunningham, and popularized by Jimmy D. Wales, the president of the St. Petersburg, Fla.-based Wikimedia Foundation.

In 2001, Mr. Wales created the most famous wiki, the mammoth online encyclopedia, wikipedia.org. At last count, that Web site boasted 2.7 million entries in 10 languages.

Now, wiki open-source online textbooks are being produced, such as through the California Open Source Textbook Project. And the Cape Town, South Africa-based Shuttleworth Foundation has created a wiki to house K-12 curriculum and lesson plans created for and by South African teachers.

The popularity of wiki and other Web 2.0 tools speak to their accessibility to everyday people. No longer do you have to be an uber-geek with a mastery of HTML or other computer language to compose on the Web. Now all it takes is a few clicks of a computer mouse.

In South Dakota, for example, 12 middle schools participated last year in a monthlong history and geography project on the Missouri River basin. The 400 students鈥攕ome separated by hundreds of miles of open prairie鈥攃ommunicated with one another via the wiki, titled Under Control, as well as through videoconferencing.

The inherent transparency and mutability of wikis were unfamiliar to the dozen or so wiki-project teachers, said Mary E. Engstrom, the Under Control project director and an assistant professor in the University of South Dakota鈥檚 school of education in Vermillion.

They received 3陆 days of training, but the most successful teachers were the ones who 鈥渆mbraced a more constructivist approach to teaching and learning, a more student-centered approach,鈥� Ms. Engstrom said.

Tricky to Use Well

Using wikis is not technically difficult, but they can be conceptually hard to use, says Paul R. Allison, the technology teacher at the 500-student East Side Community High School. He created the High School Online Collaborative Writing wiki, which is used by four public schools in Manhattan.

Some of the questions he says his colleagues ask are: How do you grade students on a collaborative writing project? Can you use the same project in consecutive years, and, if so, how do you do so without erasing the work of the previous students?

鈥淵ou can鈥檛 do the cookie-cutter essay anymore, because it won鈥檛 make sense,鈥� Mr. Allison said.

Many students have taken to using his collaborative-writing wiki, which can be used for expository writing as well more-creative compositions. For instance, on the 鈥渄iscussion鈥� page of the school鈥檚 wiki on 鈥淢acbeth,鈥� students wrote 20 adaptations of the play鈥檚 opening scene, in which three witches in a forest conspire on a coming battle.

In Shakespeare鈥檚 version, the first witch says, 鈥淲hen shall we three meet again? In thunder, lightning, or in rain?鈥� The second witch replies: 鈥淲hen the hurlyburly鈥檚 done/When the battle鈥檚 lost and won.鈥�

One student rewrote that exchange this way: 鈥淵o, where we gonna meet at?/In the [sic] Japan, Tokyo, or Mega world?鈥� The second character replies: 鈥淲hen the grasshopper is finished/And the battle is lost or won.鈥�

Security and Privacy

The democratic nature of wikis can make them prone to abuse by both students and outsiders. Technology directors should look for secure wiki software that can run with their districts鈥� technology systems, experts advise, and educators can protect their school wikis with passwords and emphasize fair-use policies to students.

The Neighborhood School, a 250-student school in Manhattan serving prekindergarten through 5th grade, started its wiki in February. Within a couple of days, said Thomas E.B. 鈥淭eb鈥� Locke, the school鈥檚 technology teacher, students had posted entries on subjects they were interested in, such as cats and alligators. But one jokester also posted an article on鈥攁nd picture of鈥斺�減oop.鈥�

Mr. Locke didn鈥檛 hit the delete button, reasoning that it鈥檚 important for students to feel a sense of ownership of the wiki. But he did discuss the issue with the student.

鈥淚n one sense, it鈥檚 pretty inventive for a 4th grader,鈥� Mr. Locke said. 鈥淚 talked to him about it, and said, 鈥楾his is a community thing. Is it necessary for the [picture] to be there?鈥� So he took it down.鈥�

The wiki for Lewis Elementary School in Portland, which is used by teachers to post notes and work together, as well as by students on class projects, is on the school鈥檚 internal, secure wireless network. That way, teachers and students don鈥檛 have to deal with outsiders looking in, said Timothy C. Lauer, the school principal, who also blogs about education technology.

But when it comes to fair use, he said, he stresses to students that posting inappropriate content is similar to writing on a school wall.

鈥淲e express to kids that the expectation we have [online] is the same for the physical world. We don鈥檛 expect you to go to Jason鈥檚 desk and scribble on it,鈥� Mr. Lauer said. 鈥淭here will be consequences if you do.鈥�