TSR Wiki > Study Help > Subjects and Revision > Revision Notes > ICT > Verification and Validation Methods
Verification Methods
A verification method makes sure that the data has been entered or transfered correctly. There are several methods used to do this.
- Double Entry When data is entered two operators may be asked to enter the data. If the entries match then the data is stored.
- Parity Check Uses the binary code to check that the data matches and that it has not been corrupted.
- Visual Check The operator is asked to just check the data visually.
Validation Checks
Validation is all about making sure that data is entered within reasonable bounds and sensibly. For example, checking if your password is too short.
The following are methods of validation.
- Range Check This ensures that the data is within range. E.g Dates (your couldn't enter 13 in the month column for example)
- Picture Check This is also refered to as a format check. This simply ensures that the data is in the correct context.
- Field Present Check/Presence Check This checks that you have actually entered the data in the box.
- Length Check This is a check to ensure data entered is at least a certain number of characters. For example, a mobile phone number must be 11 digits.
