Type
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• Noncommand user interfaces, which observe the user to infer his / her needs and intentions, without requiring that he / she formulate explicit commands.
• Object-oriented user interface (OOUI)
• Reflexive user interfaces where the users control and redefine the entire system via the user interface alone, for instance to change its command verbs. Typically this is only possible with very rich graphic user interfaces.
• Tangible user interfaces, which place a greater emphasis on touch and physical environment or its element.