Validation and Verification

Notes validation and verification for GCSE ICT

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  • Created by: Bryony
  • Created on: 05-04-10 13:15

Validation

VALIDATION, makes sure that your data is sensible and helps to reduce the number of errors when on the computer.

There are different types of validation

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Types of validation

Type Check - If you only want numbers to be entered. (E.G if you are writing the quantity of items you are selling in a shop)

Range Check- When you want to make sure that the data typed is within a range.( E.G. if you only want people over 18 to buy alcohol .. >=18 )

Presence Check - When you want to make it compulsory that certain data is entered.(E.G if you want to make sure someone fills in their age on a form)

Picture of Format Check - When you want to make sure that numbers and letters are in the right format. (E.G a postcode)

Check didgit - when you want to check a range of numbers have been entered correctly (E,G a barcode with a certain number at the end)

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VERIFICATION

Checks that the data you have entered against the original source. This is to make as few mistakes as possible.

There are three ways to do this

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Entering the data twice

You enter the data twice so that the computer can check that the two sets of data match.

An example is when you are registering for a website and they make you type in the password twice.

Disadvantages..

Its time consuming for large amounts of data

You could enter a wrong piece of data twice

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Checking against a hard copy

This is when you manually check the computer screen against a hard copy of the data, looking for mistakes.

Disadvantages :

Very time consuming

Difficult to move eyes between large amounts of data on the screen and on paper.

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Comparing two hard copies

Print out a copy of the new data and check it against the original copy. This is similar to checking against a computer screen but may be easier and they can be put close together and compared.

Disadvantages:

Easy to miss mistakes

Time consuming

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