Accuracy of data

• The two main ways of checking the accuracy of data is by Validation and Verification
• Methods of Verification

  • Presence check
  • Type check
  • Range check
  • Length check
  • Format check
  • Check digit
  • Lookup check
  • Consistency check
  • Limit check
• Validation checks that the data entered into an information system meets certain criteria, such as being within acceptable limits or having correct formats.
• The two methods are complementary. It helps cover an area where the other cannot
• Methods of Validation

  • Visual checking
  • Double data entry
  • Parity check
  • Checksums
  • Hash total
  • Control total