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
Human working memory holds information relevant to the current task; a physical or virtual external memory can help in tasks with a high working-memory burden.| Nielsen Norman Group
Labels or sample text inside a form field makes it difficult for people to remember what information belongs in that field once they start data entry.| 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
Low-contrast text may be trendy, but it is also illegible, undiscoverable, and inaccessible. Instead, consider more usable alternatives.| Nielsen Norman Group