Sometimes information the public should know is only available through sources or contributors on an 'off-the-record' or anonymous basis.

H.I.V. blood tests were performed on an anonymous basis so that neither the researchers nor the participants knew the results.

This record could be added to research databases on an anonymous basis, without any need to identify patients or to compromise their privacy.

"Advance credit is not granted on an anonymous basis."

The company is trying to persuade corporations to make the packages available to employees on an anonymous basis.

However, it may not be possible to investigate your request on an anonymous basis.

However, it may not be possible to handle a complaint on an anonymous basis.

Parents are provided with the option to object to release of information to third parties on an aggregate, anonymous basis.

Indeed, some people went as far as to say it was arbitrary, so we are calling for the publication of votes on an anonymous basis.

It is the issue of publishing the balance of votes on an anonymous basis, so that the markets and Parliament can assess the shift of opinion over time.