data validation and verification
- Created by: Elizabeth Swan
- Created on: 08-02-14 13:30
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- data verification and validation
- checks
- type check
- If you only want one type of data to be entered.
- range check
- When you want to make sure that the data typed is within a range
- presence check
- When you want to make it compulsory that certain data is entered
- picture of format check
- When you want to make sure that numbers and letters are in the right format
- check digit
- you want to check a range of numbers have been entered correctly
- type check
- entering data twice
- You enter the data twice so that the computer can check that the two
sets of data match.
- Disadvantages.. Its time consuming for large amounts of data You could enter a wrong piece of data twice
- You enter the data twice so that the computer can check that the two
sets of data match.
- checking against a hard copy
- This is when you manually check the computer screen against a
hard copy of the data, looking for mistakes.
- Disadvantage Very time consuming Difficult to move eyes between large amounts of data on the screen and on paper
- This is when you manually check the computer screen against a
hard copy of the data, looking for mistakes.
- comparing two hard copies
- Print out a copy of the new data and check it against the
original copy. This is similar to checking against a computer screen but may be
easier and they can be put close together and compared.
- Disadvantages: Easy to miss mistakes Time consuming
- Print out a copy of the new data and check it against the
original copy. This is similar to checking against a computer screen but may be
easier and they can be put close together and compared.
- checks
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