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Toolkits for user innovation User error Acorn User Lazy user model Apple User Group Connection Z User Group Active users User interface modeling User–network interface User-Mode Driver Framework Unique user Atari ST User User-subjective approach Attentive user interface Journal of Organizational and End User Computing User-defined function User activity monitoring Console user interface User environment management Principles of user interface design Lead user Persona (user experience) Web User First-time user experience Linux User and Developer Multi-user MIMO Windows USER Concurrent user Natural-language user interface Histor