Errors

Why are errors a problem?

Some errors in data can lead to catastrophic results, while others can affect the acceptability of a computer system.

As businesses and other organisations are dependent on information from computers, it is essential to try to reduce the occurrence of data errors and so ensure that the information is correct.

Results of errors

There are many examples in newspapers of the results of errors occurring in computer systems. These include pensioners receiving gas bills for millions of pounds, others who are sent letters threatening legal action unless an outstanding payment of £000.00 is received within ten days. A bug caused a newly developed fighter plane to turn upside down when it crossed the equator. Luckily this was detected during simulation testing.

When errors can occur

	Errors can occur at several stages in a system:
	When the data is captured
	When data, initially collected on paper, is transcribed (copied), usually via a keyboard, into a computer
	When data is transmitted within a computer system, particularly over a network link
	When data is being processed by software.