Validation and Verification

Question 1

Define Verification

Answer 1

Verification is checking that data has been accurately copied from one source to another

Question 2

Define Validation

Answer 2

Validation is automated checks used to ensure the reasonableness of data before accepting it.

Question 3

Name and Explain each of the 6 types of Validation checks

Answer 3

Range check = verifies that a numerical value falls within specified upper and lower limits.

Length Check = ensure that data consists of a precise number of characters.

Type Check = verifies that the entered data corresponds to a specific data type

Presence Check = checks to ensure that some data has been entered and the value has not been left blank

Format Check = checks that the characters entered conform to a predefined pattern

Check Digit =the final digit included in a code; it is calculated from all the other digits in the code.

Question 4

Name and explain both Verification checks

Answer 4

Double Entry = Data is inputted twice , the computer system compares both entries, and if they differ, an error message is displayed, prompting for the data to be re-entered.

Screen/Visual check = the user manually reviewing the entered data. This prompts the user to confirm its accuracy