Type
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• Task-Focused Interfaces are user interfaces which address the information overload problem of the desktop metaphor by making tasks, not files, the primary unit of interaction
• Text user interfaces are user interfaces which output text, but accept other form of input in addition to or in place of typed command strings.
• Voice user interfaces, which accept input and provide output by generating voice prompts. The user input is made by pressing keys or buttons, or responding verbally to the interface.