8.5: Validation & Verification
Exam Board:
Eduqas / WJEC
Specification:
2020 +
What are validation and verification checks?
Validation is a process to check that data is reasonable or sensible before it is accepted.
Verification is the process of checking that data is correct after it has been entered.
Validation Checks
Range Check
Checks data is within a certain range.
Age:
34
203
Type Check
Checks data is a certain data type.
Height (in cm):
182
Two metres
Format Check
Checks data is entered in a certain way.
Date of Birth (DD/MM/YYYY)
25/03/2001
25th March 01
Presence Check
Checks that data has actually been entered and not left blank.
Password:
fluffythecat123
Lookup Table
A table of acceptable entries, also known as a list.
Length Check
Checks the length of the input is within a certain amount.
Telephone Number
08323877319
07383
Verification Checks
Double Entry
Typing in the data twice to make sure there were no spelling errors the first time.
Password:
fluffythecat123
flufythecat123
Proofreading
Checking two copies of data to ensure they are exactly the same.
Check Digit
Similar to a checksum in a data packet, a check digit is calculated on barcodes to ensure the rest of the numbers are correct.
Address:
11 Cherry Lane
11 Cherry Road
Questo's Questions
8.4 - Validation & Verification:
1. Describe each type of validation check and give an example.
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a. Range Check [3]
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b. Type Check [3]
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c. Format Check [3]
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d. Presence Check [3]
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e. Lookup Table (List) [3]
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f. Length Check [3]
2. For the following data, suggest which validation check would be most suitable and why:
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a. Password [3]
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b. Country of Birth [3]
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c. Number of Tickets [3]
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d. Weight (in kilograms) [3]
3. Describe three types of verification check and give an example:
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a. Double Entry [3]
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b. Proofreading [3]
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c. Check Digit [2]