Controllability

user friendly design --> user is in control of the application (...) what he/she is using e.g. press play/pause(...)

Controllability in Trainex:

disadvantages:

no control over page view when logging in into trainex

language --> if you don't understand usage of a "button" than it's an impairment of controllability

Amazon- lack of customer service support/chat message function due to COVID-19

Advantage:

being able to see into other courses schedules

controllability of personal data in means of who will be able to see what

Facebook: user is able to control who can view their posts, pictures and profile