Validation and Verification

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Validation and Verification

Validation is performed by a computer programme.

What the computer checks for

Checks the data is sensible

However it cannot eliminate all errors

Uses rules/formulas

Checks that the data is reasonable

Types of validation check.

Data Type

Checking that data follows the correct rule, for example, a telephone must be numbers only and not letters

Format

Presence

checking that something has been written down.

Range

Cross field

File/table look-up

This is when we see a drop-down-box with a variety of options to make, this makes the information easier for the computer to process becasue there is a limit on the answers.

length

Checking that the data is the correct number of digits long.

Verification is when individuals check the data.

Sending back printouts

This is when we ask a customer to check the data they have given to us has been typed/written down correctly, any errors can then be pointed out and fixed.

Double entry of data

This is when a piece of data is typed in twice, if the two pices match they are accepted, this is usually seen on websites asking for a password or an e-mail address.

Proof reading

This is carefully reading what has been typed in and comparing it with whats on the data source (eg, order forms, invoices, surveys.) for any errors, so they can be corrected.

When do errors occur?

Transmission

Detect errors and re-send, Parity checks.

Processing

programming errors, incorrect formulae, processing wrong data.

Input

reduced by human involvement

transcription

Typing in errors