Google I/O 2012 - Advanced Design for Engineers

http://www.youtube.com/watch?gl=DE&v=iJDoxOTyMdk

(from http://www.androiduipatterns.com/2012/07/google-io-2012-android-design-session.html)

FUNCTION
  RESPECT DESIGN
  self Describing     (consistency, affordances, natural mapping,
                          direct manipulation, metaphor) 
                          user's mental model: 
                          they simulate the UI in their head
  prevent errors     (mode, data loss)
  make users fast   (visual hierarchy, fitt's law, hick's law) 
                          cognitive modeling:
                          algorithms to simulate user efficiency

FORM
  PEOPLE ARE SMART            THEY JUST DON'T CARE
  line things up
  use space
  what does it mean?            (best ist not always best)
  show users that you care    (what can I do that I don't have to)