optimizing User Interfaces (web sites, desktop apps, mobile apps ...)

a/b testing websites

ISO 9241 - ergonomics
 
keystroke-level model
- a low level model, to model time taken to perform a task

GOMS
GOMS (Goals, Operators, Methods, and Selection rules)
this is a HCI (Human Computer Interaction) model

Fitts's Law
- Fitts's Law allows calculation of time taken to perform a task -> avoid having to implement all possible UIs

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