4.1.4- 4.1.5

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Define Validation and Verification.
Validation is to ensure that data is sensible and of the right sort.
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How can errors occur and how can validiation minimise it?
uring input, transcription, processing, transmission.Through Checks.
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What are the validation types and give some examples.
resence check-it requires a value, which must be entered-card number, Format check- must conform to a preprescribed layout --/--/----, Range check-it must fall between 1-9 , Length check an entry has to be of a prescribed length- telephone number,
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What are the different types of verification.
Double keying- inputting a password twice to make sure it's correct, proofreading- before printing an essay
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What are the advantages of ICT over manual? (NOT how to find information)
Repetitive processing carrying out the same task repeatedly- automatic payroll, Speed of Processing- real time- Quick complex computer calculations I.E. Cash Machine, Ease of editing- can be changed without starting again I.E. homework/essays
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What factors effect the efficiency of data processing systems?
compatiblity,poor communications, hardware, software, insufficient testing and maintenance
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Give some examples of inefficiency within data proccessing systems?
Compatibility-the design on computer could be different to what has been printed out,poor communication-unclear error messages,hardware-old processor will take longer to process,maintenance(worker)- WITHOUT BACKUPS WORK WOULD BE LOST IN A POWERCUT.
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What must you consider when designing data processing systems?
speed of searching, data storage capacity, accuracy and context and different output format.
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Other cards in this set

Card 2

Front

How can errors occur and how can validiation minimise it?

Back

uring input, transcription, processing, transmission.Through Checks.

Card 3

Front

What are the validation types and give some examples.

Back

Preview of the front of card 3

Card 4

Front

What are the different types of verification.

Back

Preview of the front of card 4

Card 5

Front

What are the advantages of ICT over manual? (NOT how to find information)

Back

Preview of the front of card 5
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