Validation and Verification

Question 1

Define validation checks.

Answer 1

1) Used to ensure sensible data is entered into a computer

Question 2

State two types of validation checks.

Answer 2

1) Batch total

2) Hash total

Question 3

Explain batch total and give an example of when it might be used.

Answer 3

A batch total checks nothing is missing by adding number fields in different records to check the total.

Eg) Invoice of 1, 2 and 3p - Computer looks for batch total of 6p

Question 4

Explain hash total and give an example of when it might be used.

Answer 4

Same as batch total, but field check is meaningless.

Eg) 3 phone numbers ending in 2, 4 and 3 - computer looks for hash total of 9

Question 5

Name two types of errors.

Answer 5

1) Transcription

2) Transposition

Question 6

What is a transcription error and give an example of when it would occur.

Answer 6

A transcription error occurs when copying data to a computer

Eg) When reading bad handwriting

Question 7

What is a transposition error and give an example of when it would occur.

Answer 7

A transposition error is when characters are accidentally swapped around.

Eg) Pressing one button instead of another

Question 8

Name 3 types of verification checks.

Answer 8

1) Double Keying
2) Visual Check
3) Parity Check

Question 9

What is double keying and give an example of when it would be used.

Answer 9

Data is entered twice to check that both sets of data match up

Eg) Creating passwords when registering for a social networking website

Question 10

What is a visual check and give an example of when it would be used.

Answer 10

Proofreading or double checking something

Eg) Checking a CV before it is sent off

Question 11

What is a parity check and give an example of when it would be used.

Answer 11

Checks data is correct when being transmitted

Eg) Uploading files to a website