QUESTION: 17

Which two of the following statements best describe why it's important to distinguish between tasks and subtasks?

Tasks are for primary users; subtasks are for secondary and indirect users
According to the master-apprentice model: tasks are for the master; subtasks are for the apprentice
Tasks can be used to create usability test tasks: subtasks should be avoided as the basis for usability test tasks, because they have no inherent value in isolation
Tasks are the main basis for use scenarios, whereas subtasks are the main basis for task models
Tasks are used to derive user needs. Both tasks and subtasks are used to derive user requirements
When defining the navigation structure, it's important to focus on tasks. Subtasks are less important than tasks

Answer(s): C,D

Explanation:

Task
A set of activities undertaken in order to achieve a specific goal.
Notes:
1. Most tasks can be subdivided into subtasks - that is, activities.
2. A subtask does not in itself achieve a goal from the user's point of view but is a necessary decision or action to reach the user's goals.
3. Most subtasks lead to choices or inputs by the user when using the interactive system.
4. Some subtasks can be subdivided into smaller subtasks.
5. Subtasks are unsuitable as usability test tasks, because they are very specific

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QUESTION: 18

If a user's mental model of an interactive system is incomplete or contradictory,

then the user cannot easily use the interactive system.
then the user can still easily use the interactive system.
then the user will have to learn to easily use the interactive system.

Answer(s): A

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QUESTION: 19

Which one of the terms below best describes the following statement? 80% of 25 users who have used the car rental website at least twice before must be able to rent a car at Frankfurt Airport (Germany) for two days starting tomorrow at 09.00. Users must complete the task in under 5 minutes.

Low-fidelity prototype requirement
Use scenario
Test task
User need
Quantitative user requirement
Qualitative user requirement

Answer(s): E

Explanation:

Qualitative or quantitative user requirements are derived from user needs. User requirements must be verifiable so it is possible to determine in a usability evaluation whether a prototype fulfils them or not.
The user requirements are also used to guide the design in order to ensure that the interactive system meets user's expectations as closely as possible.
Qualitative user requirement
A statement of what users must be able to locate, recognise, understand, select or input as part of conducting a task with the interactive system to meet identified user needs in a specified context of use.
Quantitative user requirement
A required level of usability to meet identified user needs expressed in terms of measures of effectiveness, efficiency, satisfaction, accessibility, user experience and avoidance of harm from use in a specified context of use.

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QUESTION: 20

Which one of the following is NOT a human-centred quality objective for a next-generation cash machine?

Users must be able to withdraw money twice as quickly as before
Users must have a feeling of complete privacy when using the cash machine
Only users with a genuine bank card must be allowed to withdraw money Fake or stolen bank cards must be retained by the cash machine.
Users who are blind must be able to withdraw money without help from another person
Users must be able to withdraw money with any valid national or foreign bank card
Users who request a receipt must be able to understand it

Answer(s): C

Explanation:

Humancentred quality objectives
The goals that are to be achieved for the user of an interactive system when developing the interactive system.
Notes:
1. Human-centred quality objectives relate to one or more of the following components of human- centred quality: usability, accessibility, user experience and avoidance of harm from use.
Examples of human-centred quality objectives:
1. Travelers to the US must be able to pass through immigration twice as quickly as before (usability, efficiency).

2. Blind users must be able to recognise and understand the content of the website (accessibility).
3. Users must have a feeling of complete privacy when using the electronic voting booth (user experience).
4.
When using a system for creating prescriptions, the user must not be able to prescribe drugs that are incompatible with each other (avoidance of harm from use)

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Free CPUX-F Exam Braindumps (page: 5)

QUESTION: 17

Explanation:

QUESTION: 18

QUESTION: 19

Explanation:

QUESTION: 20

Explanation: