A principle stating that a system should be liberal in what it accepts and conservative in what it sends, meaning it should handle user input flexibly while providing clear, consistent output, similar to the principle of fault tolerance.
A testing method where the internal structure of the system is not known to the tester, focusing solely on input and output.
The minimum difference in stimulus intensity that a person can detect, also known as the just noticeable difference (JND).
The ability to navigate through a web page or application using keyboard keys instead of a mouse.
A qualitative research method involving direct conversations with users to gather insights into their needs, behaviors, and experiences.
The ability of users to influence the behavior and outcomes of a system or product, allowing them to interact with it according to their preferences.
Information provided by users about their experience with a product, used to inform improvements and adjustments.
A step-by-step guide that helps users complete a complex task by breaking it down into manageable steps.
The tendency for people to overestimate their ability to control events.