- Desktop PCs: Keyboards and mice are enough.
- Tableotop or surface computing: Human hands (touch), pens, and pucks.
- Mobile phones: For normal phones, keypads are sufficient. Touch and pens are good alternatives for feature-rich phones with larger display (> 2.8"). Multi-touch is feasible for displays larger than 3.5" (Think iPhone).
- Tablet PCs: They are for multi-touch and accurate pen input devices.
- Humanoids: Voice and image recognition are essential. I don't think that such "natural interface" is not natural in desktop computing. As you don't talk to your notes or typewriters, your PC doesn't need to listen to you.
- Other types of robots: Keyboards, mice, and joysticks.
See also:
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