When Eve intercepts these tweaked photons, she can gather information on them while keeping the error rate she introduces just below a tolerable level.

ECONOMIST: Secure cryptography is only as safe as its weakest link

Formalization makes it easier to compare like with like, and decreases the chance of the introduction of systematic error into a new investigation based on reusing information from another.

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This error may be because the force gave the wrong information to the Home Office.

BBC: Doubts affect inconsistent police disability statistics

We would like to correct on error, however, as well as provide some additional information.

ECONOMIST: Letters

Speaking before the trial started, Google executives said that it was a fundamental error for regulators to treat the engine as a publisher of information, rather than a distributor.

BBC: Google fights Spanish privacy order in court

The National Audit Office's annual review of HMRC, published earlier in October, found that more than 80% of investigations into possible fraud or error were carried out after an award had been made because "information on some risks was not available at (the pre-award) stage".

BBC: NEWS | Business | Tax credits 'targeted by gangs'

As investment in information technology has increased, so has the size of the potential statistical error.

ECONOMIST: The numbers racket | The

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BBC: Your guide to the BBC Embedded Media Player