状态可见(Visibility of system status)
匹配现实(Match between system and the real world)
用户掌控(User control and freedom)
标准一致(Consistency and standards)
防止出错(Error prevention)
不用回想(Recognition rather than recall)
灵活高效(Flexibility and efficiency of use)
简约美观(Aesthetic and minimalist design)
错误提示(Help users recognize, diagnose, and recover from errors)
帮助入口(Help and documentation)
by Jakob Nielsen(Principal of the Nielsen Norman Group)