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Question 3(UI Design)

3. (20) UI Design Process

(a). (6) What is the fundamental rule of user interface design?

Answer: Know thy users (for they are not you)

The answer should have the basic idea of understanding user characteristics as oppsed to a UI designer designing for himself or herself. Some mention of understanding the task is also ok as part of the answer.

(b) (8) Consider our old friend the Clock interface shown in the upper corner of this page. Evaluate it as in interface design, using the rules of thumb from Chapter 6, considering the primary tasks performed by a user of this clock.

(3 points) Primary task: reading the time. The interface is pretty good for this, but the amount of display taken up by the time setting buttons may be distracting.

(3 points) Secondary task: set the time. Buttons to do so are obvious, but feedback when buttons are clicked is minimal (digits change in the time).

(2 points) Avoid user errors: time setting buttons are big (attractive to the eye) and easy to hit accidentally. This arrangement is too likely to result in user errors.

(c) (6) What is a “cognitive walkthrough” and what is its role in the user interface design and evaluation process?

(4 points) A cognitive walkthrough is a systematic evaluation of whether the system and its interface will make sense to a user.
Oher possible details: a walkthrough of the process of using the systems, asking evaluation questions at each step about user understanding and interaction with the system.

(2 points) It is a means of interface evaluation prior to user testing or when user testing is impossible.

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