IGCSE ICT Unit 15 Proofing
What is validation? (3) - correct answer-Checking that data entered is reasonable and to see
if it satisfies certain criteria and falls within accepted boundaries.
Presence check - correct answer-Is data actually present in a field, or has it been missed
out?
Range Check - correct answer-Is the data value within a set range?
(E.g. an exam mark should be between 0% and 100%, a month should be between 1 and
12)
Length Check - correct answer-Is an item of text too short or too long?
Type Check - correct answer-Is the data the correct type?
(E.g. the letter 'A' should not be allowed in a numeric field)
Format Check - correct answer-Is the data in the correct format?
(E.g. a date of birth should be entered as dd/mm/yyyy)
What is verification? - correct answer-A way of preventing errors when data is copied from
one medium to another.
What can verification do? - correct answer-Reduce the errors made when data is entered
into the computer.
Two common ways of verification checks - correct answer-Visual checking and double data
entry
Explanation of visual verification (checking) - correct answer-Compare the original paper
documents with the data entered into the computer
Explanation of double data entry (4 points) - correct answer-Data is entered into a system
twice (often by two different people) and compared by the computer and any differences in
the data is flagged as an error and can be correct by the user.
Why are validation and verification needed? - correct answer-To reduce the number of errors
in data entry
What is validation? (3) - correct answer-Checking that data entered is reasonable and to see
if it satisfies certain criteria and falls within accepted boundaries.
Presence check - correct answer-Is data actually present in a field, or has it been missed
out?
Range Check - correct answer-Is the data value within a set range?
(E.g. an exam mark should be between 0% and 100%, a month should be between 1 and
12)
Length Check - correct answer-Is an item of text too short or too long?
Type Check - correct answer-Is the data the correct type?
(E.g. the letter 'A' should not be allowed in a numeric field)
Format Check - correct answer-Is the data in the correct format?
(E.g. a date of birth should be entered as dd/mm/yyyy)
What is verification? - correct answer-A way of preventing errors when data is copied from
one medium to another.
What can verification do? - correct answer-Reduce the errors made when data is entered
into the computer.
Two common ways of verification checks - correct answer-Visual checking and double data
entry
Explanation of visual verification (checking) - correct answer-Compare the original paper
documents with the data entered into the computer
Explanation of double data entry (4 points) - correct answer-Data is entered into a system
twice (often by two different people) and compared by the computer and any differences in
the data is flagged as an error and can be correct by the user.
Why are validation and verification needed? - correct answer-To reduce the number of errors
in data entry
