File organisation

—Data verification

—A data item can pass validation checks but still be inaccurate due to copying error. Verification means double-checking for accuracy when data are copied.

—Visual check

—Double check

—Parity check

—Visual check

—A single operator reads through a whole record`s data on the display screen, comparing each item with the original document to check for and correct any errors.

—Double entry

—Two operators enter the data as two people are less likely to make the same error. The program compares the two inputs and only accepts them if they match. If they are not the same, the software can ask one operator t o resolve the discrepancy or refer the source of the data for further investigation.

—Parity check

—Electronic copying errors during transmission across networks can be  detected and, in some cases, even corrected by number of methods.

—File organisation