What is a guiding principle derived from Norman’s work that emphasizes UX applies equally to a microwave's flashing light and a web app's loader icon?

Answer

The principle of feedback

The principle of feedback, which addresses the psychological need for action confirmation, applies universally, whether through a physical indicator like a microwave light or a digital element like a web application's spinning icon.

What is a guiding principle derived from Norman’s work that emphasizes UX applies equally to a microwave's flashing light and a web app's loader icon?
inventionprincipleuser experienceUX design