Chapter 20 - Managing Information

Question 1

What are controls over information systems

Answer 1

It is vitally important that adequate controls are in place in order to help ensure the information in the system is accurate and that controls exist to maintain the security of confidential information. Examples of controls include

Data verification

Data validation

Direct data capture

Physical access controls

Passwords

Firewalls

Antivirus software

Encryption

Question 2

What is data verification

Answer 2

Trying to verify everything that is input is 100% accurate only way to do this is to have information entered twice where two employees write out the same information and computer checks that it is the same. This is however expensive and therefore companies tend to use data validation instead

Question 3

Examples of data validation

Answer 3

Consistency checks
– ensure all Bates imports is DDMMYYYY and also age in numbers so that the computer can check if the date of birth and the age of the same

Format checks
-like a name and it should be all letters

Range checks

Look up tables
– if type in numbers states who it is so you know you have typed in the correct employee number

Check digits
-to stop transposition you have 4 standard digits and based on a calculation of the other four the digit is called a check digit

Question 4

What does Direct data capture mean

Answer 4

Not typed manually e.g. barcodes