How data errors can occur
topic 4, validation and verification :D
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?- Created by: Corrine
- Created on: 24-02-13 14:31
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- How data errors occur
- Problems with inaccurate data
- incorrect decisions being made resulting in loss of money
- goods being sent to the wrong address
- having to spend time sorting out mistakes
- loss of goodwill and trust
- being prosecuted under the Data Protection Act 1998 for not keeping the data accurate
- How errors can occur during transcription
- Transcription errors are mistakes humans make when either keying in data or filling in forms such as optical mark forms
- Often they occur through carelessness and are not picked up by verification methods such as proof reading
- Transcription is the process of copying data from a source document such as an order form or an application form
- How errors can occur during input
- Input data even though it has been verified and validated, can still be incorrect
- Incorrect data can occur in a variety of different ways and it is usually has any human involvement at any stage of the input
- Keyboard Errors
- Optical Mark Reconition
- Bar Code Readers
- How errors can occur during processing
- Programming error that remained undiscovered during testing.
- The use of the wrong version of a data file rather than the latest version
- Incorrect formulas in spreadsheet that were not detected and corrected during testing
- Damage by viruses - viruses are able to delete data or otherwise render it unreadable
- Malfunction - hard disk drives are like any mechanical device in that they break down occasionally
- Damage by viruses - viruses are able to delete data or otherwise render it unreadable
- Incorrect formulas in spreadsheet that were not detected and corrected during testing
- The use of the wrong version of a data file rather than the latest version
- Programming error that remained undiscovered during testing.
- Problems with inaccurate data
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