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error correction[′er·ər kə‚rek·shən]
Any system for reducing errors in an incoming message, such as sending redundant signals as a check.
Computer device for automatically locating and correcting a machine error of dropping a bit or picking up an extraneous bit, without stopping the machine or having it go to a programmed recovery routine.
Correction of time errors in interconnected alternating-current power systems resulting from deviations from normal frequency, in order to make all areas synchronous.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
error checkingTesting for accurate transmission of data over a communications network or internally within the computer system. See error messages, parity checking, CRC and validate.
validity checkingRoutines in a data entry program that test the input for correct and reasonable conditions, such as account numbers falling within a range, numeric data being all digits, dates having a valid month, day and year, etc. Checking the spelling of proper names, if possible, can also be part of validity checking. See validate for a comparison of "validate" and "verify."
Errors Can Be Critical
It may seem like a dull part of the IT world, but data entry validation can be a very critical issue when there is insufficient validity checking of the input. In late 2001, a Japanese stockbroker erroneously placed a sell order for 610,000 shares of stock at 16 yen, when it should have been for 16 shares at 610,000 yen. Even though the error was caught two minutes after the order was placed, the broker's liability was estimated to be up to USD $100 million.
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