nngroup.com10 Usability Heuristics for User Interface Design
Jakob Nielsen's 10 heuristics are a set of broad principles for evaluating interaction design, published on the Nielsen Norman Group website. Each heuristic covers a general rule of thumb — such as visibility of system status or error prevention — with a short explanation and examples. The list is commonly used as a framework for heuristic evaluation, where reviewers assess an interface against each principle to identify usability problems.