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Topic 4 - Coggle Diagram
Topic 4
Validation
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Data Type Check
Data must be a specified type eg numerical, text. boolean
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Check Digit Check
An extra number is added to the end of the barcodes to check that they are read correctly OR doing some maths on a code number to generate an extra number on the end
Barcodes and back account number- Prevent invalid account numbers being entered or to prevent the transposition of numbers
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How Errors Occur
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Input
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Multiple choice answer sheet has been incorrectly marked by a student -> rejected by the optical mark reader
Processing
Data is input into a spreadsheet -> contains incorrect formulae-> output from the spreadsheet= incorrect or a programming error can lead to incorrect information being output
Transmission
Data is sent through a communication medium (cables/wires) errors can occur -> lead to incorrect information being output
Verification
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Checks
Proof Reading
Read before you submit or checking document against what has been entered on the screen <- both matched?
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Double Entry
Data may be entered twice-> one checking the other <- input :red_cross: identical the computer shows a verification error
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Data can be valid but not correct -> Valid data could pass any validation checks but it may not be correct eg A customer completes a from DOB= 05/06/08 then the data clergy makes a transcription error -> 06/05/08
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