3.1.1 ICT Verification
- Created by: Bellaxox
- Created on: 21-11-17 12:14
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- Verification
- It reduces errors however it doesn't eliminate them
- It checks that data has been transferred correctly from the original source
- Verification also only reduces errors
- Methods are double entry and proof reading
- Double entry
- User inputs data twice
- Computer compares both data items
- If both data items match then it saves data
- If it doesn't match it rejects data, error message or try again
- Proof reading
- User enters data
- User visually checks data on screen with original data
- Errors are corrected
- Transcription
- When a mistake is made copying the data
- Transposition
- When you have reversed two numbers or letters
- Purpose of verification
- Designed to trap transcription / transposition errors
- Problems
- Manual verification: blurred eyes, tired eyes meaning checking data on the document maybe hard
- Sometimes people can repeatedly see the wrong thing
- Computer verification: may have made the same data entry error twice and therefore may not be picked up
- Back up and archive
- Back up
- A copy of data
- Backups can be made to tape, re-write optical memory, flash memory
- Store the back up data away from the original data
- Make regular backups as often as you can afford to lose the data
- Keep more than one version of the backup
- Archieve
- Some data is only needed on rare occasions
- Data is moved to offline storage, not copied
- Increased available main storage for other data
- Can be moved to: tape, CD-R, other storage
- Back up
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