The cross-checking method

The cross-check principle consists of a concept and a specific test protocol from various angles or sources to determine validity or accuracy.

The first strategy requires agreement between both tests before a decision can be made. This strategy can significantly improve testing performance; howeverv the cross-check protocol can use a third test when the first two tests disagree.

The second unusual strategy is to employ an intermediate criterion. Somewhat surprisingly, this intermediate criterion has the ability to simultaneously increase protocol hit rate and decrease protocol false alarm rate relative that of the individual tests in the protocol.

Some examples possible:
 * Repetition codes


 * Parity bits


 * Checksums


 * Cyclic redundancy checks (CRCs)


 * Cryptographic hash functions


 * Error-correcting codes

Sources:
http://www.thefreedictionary.com/cross-check

https://www.ncbi.nlm.nih.gov/pubmed/12956310