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A User Interface is:

-boundaries at which users and systems must meet to perform actions
-the part of the tool with which users interact to use it and achieve their goals


What are the three vertices of the usability triangle?

Users, Task, Tool


How do we define usability:

The usability of a product is the degree to which specific users can achieve their goals within a particular environment, effectively, efficiently, comfortably and in an acceptable manner


What are some metrics of usability

efficiency, effectiveness, satisfaction, memorability, learnability, flexibility,


What are the two types of usability evaluation?

-formative (test as we build and re-adapt)
-summative (comparing finished systems)