Part C: User Interface

Question 1

ISO 9241-11:1998 provides “guidance on usability” as part of the statement on “Ergonomic requirements for office work with visual display terminals”. What are the key elements of this standard’s definition of “usability”?

Answer 1

The effectiveness, efficiency and satisfaction
With which specified users
Can achieve specific goals
In particular environments
The focus on specifics implies no generalisation

Question 2

Usability engineering can be a very expensive activity. Nielsen has suggested the adoption of “discount usability engineering” which defines a minimal set of activities. What does he propose?

Answer 2

He proposes that You should observe the users using the app in silence. Capture why they do as they do, while they are doing it.
He propose that the users can navigate and try a simulated app and you get rapid feedback

Question 3

Usability heuristics

What is meant by a heuristic? There are a great many usability heuristics – provide 6 example usability heuristics.

Answer 3

A heuristic technique, or a heuristic, is any approach to problem solving or self-discovery that employs a practical method that is not guaranteed to be optimal, perfect, or rational, but is nevertheless sufficient for reaching an immediate, short-term goal or approximation.¨
#1: Visibility of system status
#2: Match between system and the real world
#3: User control and freedom
#4: Consistency and standards
#5: Error prevention
#6: Recognition rather than recall
#7: Flexibility and efficiency of use
#8: Aesthetic and minimalist design
#9: Help users recognize, diagnose, and recover from errors
#10: Help and documentation

Question 4

What is the basic structure of a state chart?

Answer 4

You have objects that show the current state and arrows between the objects that describe the event that caused that certain state.