Users scan web pages due to bad computer screens and attention economics: not worth investing too much of the user's time in reading a page when it competes with millions of others.| Nielsen Norman Group
Thoughtful design is transparent and easy to understand, provides a preview, and helps users to easily correct their errors.| Nielsen Norman Group
Search engine users click the results listings' top entry much more often than can be explained by relevancy ratings. Once again, people tend to stick to the defaults.| Nielsen Norman Group
Select a single radio button by default in most cases. Reasons to deviate or not: expedite tasks, the power of suggestion, user expectations, safety nets.| 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
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