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Computer Science · May / June 2020 · Paper 21 · Question 3

0478

As printed in the paper

The question as text

Programs can perform validation and verification checks when data is entered.

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Show the answer and mark scheme

  • 3(a)[4]

    One mark for each correct validation check (max two)

    Range
    Length
    Type
    Check Digit

    One mark for each correct related purpose (max two) e.g.

    To make sure the data entered falls within a specific set of values
    To make sure the data entered is no longer than specified
    To make sure the data entered follows rules related to whether it is numbers of letters
    To make sure an identification code entered is genuine or possible

  • 3(b)[1]

    One mark for correct verification check (max one)

    Double (data) entry
    Visual check

  • 3(c)[2]

    Any two correct statements (max two) e.g.

    Validation checks if the data entered is possible/it cannot check if data has been entered correctly.
    Verification checks if the data entered matches the data submitted for entry/ it does not check if data matches set criteria.
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