Ricardo Sato

Layout
- Occlusion (what content is blocked by hands or other people)
- Button size (Fitts' Law) – Text size create (legible from 4' away)
- Usable from multiple directions

Visuals
- Highly visual: The less words and the more specific the imagery, the easier it will be for a broad demogrphic to use the device.
- No irrelevant information (Anyone ordering olives in their Bailey's simply needs to be cut off)
- Transitions: When working on your state/transition diagram, Transitions should be planned carefully. The way content and controllers animate can do a huge amount to suggest what they do, how to use them, and whether touch events have been registered.

Interaction
- Strong progressive disclosure
- Modeless controls
- Privacy (what and when should various users have access to what information, private pin #'s, etc.
- Provide a visual cue that all touches have been registered…even when they don't trigger a state change.