Proofing Techniques (Cambridge (CIE) IGCSE ICT)
Revision Note
Written by: Robert Hampton
Reviewed by: James Woodhouse
Verification
What is verification?
Verification is a method of checking that data being copied from one medium to another does not contain errors
Verification does not prevent all errors, it helps to reduce errors in the data entry process
The two most common verification techniques are:
Visual verification
Double data entry verification
Visual verification
Manual method of verifying data by comparing the source with the entered data
Double data entry verification
A method where data is entered twice and then compared for inconsistencies
Is there a need for validation as well as verification?
While verification ensures data is entered correctly, validation makes sure the data is sensible, reasonable and within acceptable boundaries
Both verification and validation are essential in maintaining data accuracy and quality
Worked Example
A local railway company is considering introducing a new system for its passengers using e-tickets on a smartphone. Details of each of the passengers have been entered into the database.
a. Give one reason why this data was verified on entry.
[1]
Proofreading is sometimes thought to be verification.
b. Explain the difference between verification and proofreading.
[2]
Answers
a. To ensure that the data entered has been copied correctly [1]
b. Proofreading is checking the content of the data for errors [1]
Verification is comparing the data with the original [1]
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