Possibilities for using an object or interface.
The cost of buying a user interface component.
The completion times for a typical task.
User settable preferences.
Run a thinking aloud test.
Draw up a user profile.
Analyse user complaints.
Observe some representative users.
Two groups of usability testers compare their results for the same interface.
It is used for usability benchmarking.
It is an online comparision of data transfer rates.
Competing systems are analysed.
Is used to role-play through an interface design.
Is a real person.
Represents a particular type of user.
Should represent an average user.
A group of usability experts judge an interface with a detailed checklist of guidelines.
A group of test users conduct a formal experiment.
A group of psychologists administer a questionnaire.
A group of usability experts review a user interface according to a small set of principles.
More often than not, intuitions are wrong.
Designers believe users always follow illogical paths.
Experience changes ones perception of the world.
Testing the performance under user stress is important.
Slows down the user by about 17 percent.
Cannot provide performance data.
Cannot provide process data.
Is useful in the early stages of development.
Process data are collected.
Objective measurements are made.
A larger number of test users is needed.
A fully implemented system is required.