- Natural Interaction
- Direct Interaction
- Terse and Powerful Interaction
- Non Self-Revealing
- Immersion Syndrome:
- Segmentation of Physical Actions
Segmentation of physical actions was not a serious problem in the era of single-touch touch screens. In the period, there were a small number of gestures and gesture themselves are simple and easy to remember such as tap, double-tap. As time goes by, interfaces now provide so many natural multi-touch gestures. It's a source of headaches for developers and users. Users have to remember gesture vocabularies and developers have to provide a reliable gesture recognition algorithm that robustly differentiates many gestures in real-time.
Link: Lift Seminar @ Imaginove about gestural interfaces via Touch Usability