Achieving Results

using a product for its intended task is not always obvious for most users

task familiarity

user background

environment

since the designer spent a lot of time working on the product, it is obvious to them how to use it

especially difficult for tasks the user is not very familiar with

user limitations (focus, ergonomics)

(perceived) urgency or danger can cause stress

aspects of the environment (e.g. movement, noise) can add to difficulties