Users won’t read web content unless the text is clear, the words and sentences are simple, and the information is easy to understand. You can test all of this.| Nielsen Norman Group
Design elements near each other are perceived as related, while elements spaced apart are perceived as belonging to separate groups.| Nielsen Norman Group
The interaction cost is the sum of efforts — mental and physical — that users must deploy in interacting with a site in order to reach their goals.| Nielsen Norman Group
What users believe they know about a user interface impacts how they use it. Mismatched mental models are common, especially with designs that try something new.| Nielsen Norman Group
The total cognitive load, or amount of mental processing power needed to use your site, affects how easily users find content and complete tasks.| Nielsen Norman Group
What is usability? How, when, and where can you improve it? Why should you care? Jakob Nielsen defines key usability concepts - give to your boss or anyone else who doesn't have much time, but needs to know basic usability facts.| Nielsen Norman Group
Jakob Nielsen's 10 general principles for interaction design. They are called "heuristics" because they are broad rules of thumb and not specific usability guidelines.| Nielsen Norman Group