Verification
A validation check is an automatic check made by a computer to ensure that any data entered into the computer is sensible
Examples of Verification:
- On-Screen Prompts : After a user has entered some data it is redisplayed on the screen. The user is prompted to read the data and confirm that it has been entered correctly. If the user has entered any data incorrectly he should respond that the data is inaccurate and retype the incorrect parts.
- Dual Input : This method is used when data is entered at the keyboard. The data to be entered is typed in twice by two different operators. The two copies of the data are then compared. Any differences are detected. The operators will be prompted to retype the sections that differ until both copies agree. When the two copies agree it is assumed by the computer that the data has been entered correctly.
Validation
A verification check ensures that data is correctly transferred into a computer from the medium that it was originally stored on.
Examples of Validation:
| 1. Range Check: To make sure that the value of a number is within a certain range 2. Format Check: If there is a word in a number then it raises an error and vice-versa 3. Length Check: If the length of an input is greater than a certain number, then it raises an error 4. Check Digit: Number obtained by an algorithm which checks if the number is valid 5. Presence Check 6. Character Check |