Chapter 2

Question 1

3 Functions of a Stock Control System (6 Marks)

Answer 1

1. Keep track of purchased goods to make sure they are sold within date.
2. Monitors sale and stock levels of each product, helps management plan future purchases.
3. Maintains min stock level so users knows how quickly stock is used and when to re-order.

Question 2

What is a mental model? (2 Marks)

Answer 2

A model which the end user creates in their mind of how the system should work.

Question 3

Identify three characteristics of a multi-tasking operating system ( 3 Marks)

Answer 3

1. Processor carries out more than one process at one time.
2. More than one CPU.
3. OS gives specified time to each application.

Question 4

Describe how colour should be considered when designing a Human Computer Interface (HCI).

Answer 4

1. Colours shouldn’t clash so text is easy to read.
2. Colours must match user expectations. Error message = red, user has done something wrong.
3. Use of contrasting colours for partially sighted and colour blind colour combinations used.

Question 5

Justify the use of WIMP (3 points)

Answer 5

1. Does not have to remember lots of code to operate it.
2. Less training required for end user- use it straight away.
3. Similar to previously used systems so higher confidence and less resistance to change.

Question 6

Explain the importance of matching the online ordering interface to the user’s mental model. (6 Marks)

Answer 6

1. Less training time is required because it will be what they expect.
2. Increased productivity as less training is required.
3. Less resistance to using the new site as it operates the way they think it should.

Question 7

Describe two ways the model [MHP or Mental Model] can be applied to the redesign of the user interface. [6]

Answer 7

1. A flashing cursor will indicate where the user is to enter data.
2. A beep may sound when a mistake is made.
3. Many colours have meaning to people and so account needs to be taken of this.