Validation/Verification

Question 1

What is validation?

Answer 1

Validation is check that is performed by the computer as the data is being entered into the system.

Question 2

They will ensure that the data is:

Answer 2

Sensible, reasonable, within acceptable boundaries and complete.

Question 3

What are the main categories of validation checks?

Answer 3

Range checks, type checks, presence, checks, length checks, lookup checks, picture checks and digit checks.

Question 4

What are range checks?

Answer 4

A range check sets an upper and lower boundary for the data. The data must lie between those two values.

Question 5

What are type checks?

Answer 5

This makes sure that the data entered is of the correct type. e.g. Numeric, string, boolean and date/time.

Question 6

What are presence checks?

Answer 6

(Also called existence checks). This checks that there is something filled in and will insist that a value is entered for that field.

Question 7

What are length checks?

Answer 7

A single character has a length of 1. ‘Hello’ has a length of 5. A length check ensures that the date isn’t more than a set number of characters.

Question 8

What are lookup checks?

Answer 8

A lookup check takes the value entered and compares it against list of values in a separate table.

Question 9

What are picture checks? (Also called format checks or input masks)

Answer 9

Same data entries may be a combination of numbers and letters, so you cannot use a type check. But the location of letters and numbers may be the same each time: (BLTR36). This checks they are always in that format.

Question 10

What is a check digit?

Answer 10

Refer to the book for this one. (pg 26 - 27)

Question 11

What is verification?

Answer 11

When you enter information from a piece of paper to a computer, you must verify it to make sure it is the same.

Question 12

What is the source document?

Answer 12

The paper based copy of your data is called the source document.

Question 13

What is the object document?

Answer 13

The copy on the computer is called the object document.

Question 14

How do your verify they are the same?

Answer 14

Verification is making sure that the information on the source document is the same as the information on the object document.

Question 15

VERIFICATION:

Answer 15

Does NOT ensure that the information is correct, just that it has been copied correctly from the paper to the computer.

Question 16

What are the two main methods of verification?

Answer 16

Double entry and manual verification.

Question 17

What is double entry?

Answer 17

This is entering the data twice. The computer compares the two sets of data and informs the user if they are different. This happens when creating a new password.

Question 18

What is manual verification?

Answer 18

This is proofreading the data. Just checking that it’s the same. Not very reliable due to human error.

Question 19

What are the two main errors when entering data into a computer?

Answer 19

Transcription errors and transposition errors.

Question 20

What are transcription errors?

Answer 20

Transcription errors are when you have made a mistake copying the data. So hitting a wrong key or hitting two keys at once.

Question 21

What are transposition errors?

Answer 21

Transposition errors are when you have reversed two numbers or letters.

Question 22

VALIDATION + VERIFICATION:

Answer 22

Don’t make sure the information is correct. Validation makes sure it is set to rules and verification makes sure it is the same as the source information.