Imagine if, in August 2001, the US intelligence agencies had dumped all of their information into one secure, online resource where it was searchable and accessible to anyone who had the proper clearance. Who knows if the terrorist attacks of September 11 could have been averted? But one thing is clear in the documentation and reporting that has come out in the past five years: Intelligence agencies then were not talking to each other enough, owing to divisional rivalries, lack of trust and the bunkering of intel operations in their own “silos.’’

Now the intelligence agencies are trying to remedy those problems with something they call Intellipedia, a model based on the popular online, user-generated encyclopedia Wikipedia.

US intelligence czar John Negroponte discussed the database in Washington recently, saying it would allow analysts to collaborate, adding and editing intelligence to create a resource for all 16 US agencies that have access to the top-secret version of Intellipedia.

Since its introduction in April, the classified version of Intellipedia has grown to 28,000 pages and 3,600 registered users, the government said. There are other versions of the database for “secret’’ and “sensitive but unclassified’’ intelligence. US officials said Intellipedia is currently being used to prepare a report on Nigeria. Authorities say they will offer access to Intellipedia to allies Canada, England and Australia.

In theory, Intellipedia, like Wikipedia, is a great idea: Citizen editors, or in this case, intelligence assets, enter their information unfiltered onto the great database. Then it becomes easily searchable by any user. For instance, if the agency preparing the report on Nigeria punches in that country’s name, it could find intelligence that an asset has entered from the field in Africa, or data entered by an analyst in a cubicle in Langley, Virginia. There are other possible uses, as well, the agencies said, such as quickly spreading information about pandemic potential from nation to nation.

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