Validation and Verification

Validation and Verification

Validation

• Ensures that only data that is reasonable is accepted.
• Different types of validation checks:
  • Range check: Checks that the value of a number is between an upper value and a lower value.
  • Length check: Checks that the data entered is a reasonable number or an exact number of characters.
  • Type check: Checks that the data entered is of a given data type.
  • Presence check: Checks to ensure that some data has been entered and the value has not been left blank.
  • Format check: Checks that the characters entered conform to a pre-defined pattern.

Verification

• Used to check that the data does not change as it is being entered.
• Different types of verification checks:
  • Double entry: The data is entered twice and compared to ensure that both entries are the same.
  • Screen/visual check: A manual check to ensure the data on the screen is the same as the form.