The tone of any piece of digital content can be analyzed along 4 dimensions: humor, formality, respectfulness, and enthusiasm.| Nielsen Norman Group
Depending on how representative designers are of the target audience, a project might need more or less user testing. Still, usability concerns never go away completely.| Nielsen Norman Group
Measure people's attitudes toward a user interface by a controlled vocabulary test: give users the list of product reaction words and asks them to select those that best describe the design.| Nielsen Norman Group