Unit 7.5 - validation and verification

Question 1

Purpose of validation

Answer 1

Automatic check that makes sure that any data is entered is sensible and meaningful (in terms of checking if data type is correct and if it falls in correct range).

Question 2

5 types of validation checks

Answer 2

1. Range check - verifies entered value falls within specified range using if else statements
2. Length check - length/number of characters enterred
3. Type check - cofirms if correct type of data has been entered (confirm data types)
4. Presence check - ensures data is present in excpected field/place, not left blank
5. Format check - checks if input uses a specified format

Question 3

Check digit

Answer 3

Type of validation uses specific number in a sequence of digits to validate input (e.g. barcode). Spots human data entry erros/transmission errors

Question 4

Verification

Answer 4

Process that helps check if data is correct/the same as intended by matching entered data to expected values. Checks that value entered has not been changed on input. E.g. checking date of birth or password

Question 5

2 types of verification

Answer 5

1. Visual check - user manually verifies input data against original source of data (prevents data entry errors)
2. Double entry check - automated verification where the system asks you to re-type/input the same data twice