This article provides an overview of Jakob Nielsen's 10 Usability Heuristics, which are guidelines for creating user-friendly websites and applications. The heuristics cover topics such as user control, visibility of system status, error prevention, and consistency and
From Wikipedia
Jakob Nielsen is a Danish web usability consultant, human–computer interaction researcher, and co-founder of Nielsen Norman Group. He was named the “guru of Web page usability” in 1998 by The New York Times and the “king of usability” by Internet Magazine.