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10 Usability Heuristics for User Interface Design
High usability is very important when it comes to websites or interfaces where users are trying to complete a task. But if we want to encourage people to play or want to be experimental, making something that violates all usability rules and is deliberately anti user friendly can actually increase engagement (see Principle 29).
Irene Pereyra • Universal Principles of UX: 100 Timeless Strategies to Create Positive Interactions between People and Technology (Rockport Universal)
Two of the most important characteristics of good design are discoverability and understanding.
Don Norman • The Design Of Everyday Things
Discusses usability heuristics i.e. principals used with UX design
Jakob Nielsen • Usability 101: Introduction to Usability
Don't Make Me Think, Revisited: A Common Sense Approach to Web Usability (Voices That Matter)
amazon.com