06 Lecture Flashcards
Define Usability
Measures how well a user can use the system functionality and is measured by five categories
In which five categories is Usability measured?
- Learnability
- Efficiency
- Memorability
- Errors
- Satisfaction
What is a Heuristic Evaluation?
A usability engineering method to find usability problems
in a user interface design.
Heuristic Evaluation is an application of Nielsen’s 10 heuristics
What is Usability Testing?
Watching a user interact with the user interface of the
system
Define Prototyping
Prototyping is externalizing and making concrete a design idea for the purpose of evaluation
What is Falsification
The act of disproving a theory or hypothesis
What is a Horizontal Prototype?
- Show wide range of features
- Horizontal integration
- Bottom up, Top down
Used in linear processes:
• No full implementation up to the end
What is a Vertical Prototype?
- Show small range of features (scenario, user story) - Full implementation of these features - Vertical Integration - Used in agile processes
When to use Horizontal Prototyping
traditional Approach
When to use Vertical Prototyping
agile Approach
What is Revolutionary Prototyping?
Get user experience with a throwaway version
What is Evolutionary Prototyping?
Used as the basis for the implementation of the
final system
What are the advantages and disadvantages of Revolutionary Prototyping?
Advantage:
Can be developed in a short amount of time
Disadvantage:
Users may have to accept that features in the prototype are expensive to implement
What are the disadvantages and disadvantages of Evolutionary Prototyping?
Advantage:
Short time to market
Disadvantage:
Can be used only if target system can be constructed in a prototype
3 Risks of Prototyping
- Customer Expectations
- Developer becomes attached to the prototype
- Cost for implementing prototypes
Who created MHP (Model Human Processor)
Card, Moran, Newell (1983)
What does Fitts’s Law (Paul Fitts, 1954) specify?
Specifies how fast you can move your hand to a target of a certain size at a certain
distance (within arm’s length)
