Usability inspection is a cost-effective method for evaluating user interfaces to identify usability issues. It is an informal approach that is easy to use and can be applied at various stages of the usability engineering lifecycle. The main methods include heuristic evaluation, cognitive walkthroughs, pluralistic walkthroughs, feature inspection, consistency inspection, and standards inspection. Heuristic evaluation involves usability specialists assessing whether interface elements follow established usability principles. Cognitive walkthroughs simulate a user's problem-solving process to check if the interface supports the user's goals. Pluralistic walkthroughs involve meetings with users, developers, and human factors experts to discuss interface elements. Feature inspection checks for usability issues in proposed features, while consistency inspection ensures that an interface behaves consistently across different projects. Standards inspection verifies compliance with interface standards. Usability inspection methods are often used when user testing is not feasible due to cost or time constraints. Combining multiple methods can yield the best results. Formal usability inspections combine individual and group methods. While usability specialists typically provide better results, regular developers can also serve as evaluators. The summary is based on the author's work and references to studies and books on usability inspection methods.Usability inspection is a cost-effective method for evaluating user interfaces to identify usability issues. It is an informal approach that is easy to use and can be applied at various stages of the usability engineering lifecycle. The main methods include heuristic evaluation, cognitive walkthroughs, pluralistic walkthroughs, feature inspection, consistency inspection, and standards inspection. Heuristic evaluation involves usability specialists assessing whether interface elements follow established usability principles. Cognitive walkthroughs simulate a user's problem-solving process to check if the interface supports the user's goals. Pluralistic walkthroughs involve meetings with users, developers, and human factors experts to discuss interface elements. Feature inspection checks for usability issues in proposed features, while consistency inspection ensures that an interface behaves consistently across different projects. Standards inspection verifies compliance with interface standards. Usability inspection methods are often used when user testing is not feasible due to cost or time constraints. Combining multiple methods can yield the best results. Formal usability inspections combine individual and group methods. While usability specialists typically provide better results, regular developers can also serve as evaluators. The summary is based on the author's work and references to studies and books on usability inspection methods.