22.214.171.124 explain the difference between the terms verification and validation
Validation & Verification
Types of validation
1. Entering the data twice (Double entry)
Think about when you choose a new password, you have to type it in twice. This lets the computer check if you have typed it exactly the same both times and not made a mistake. It verifies that the first version is correct by matching it against the second version.Whilst this can help to identify many mistakes, it is not ideal for large amounts of data.
2 Checking the data on the screen against the original paper document (Proofreading data or Visual check)
This saves having to enter the data twice. It can help pick up errors where data has been entered incorrectly or transposed.
However, it isn’t always that easy to keep moving your eyes back and forth between a monitor and a paper copy. Also, if you are tired or your eyes feel 'blurry' then you might miss errors.
3 Printing out a copy of the data and comparing the printout to the original paper document.
This is probably the easiest of the verification methods because you can have both copies side by side and scan both for mistakes.However, it can be time consuming if there is a large amount of data to check and if you do it too quickly, mistakes could be overlooked.
Ex.1 Test "Data validation and verification"
Ex. 2 Quiz "Validation check"
Question. Explain what is meant by data validation. (Marks: 3)Answer:
Question. Explain how a range check could be used to validate the reference number. (Marks: 2)Answer:
Question. What is the name of the extra digit at the end of the reference number? (Marks: 2)Answer:
Question. Explain how the extra digit at the end of the reference number can help to reduce errors. (Marks: 3)Answer:
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