Representation and cognition

A Good Representation sows all of the relevant information, and nothing else.
Should enable:

1.  Comparison
2.  Exploration
3.  Problem solving

When interfaces help people distribute cognition, it can...

• Encourage experimentation (Tetris)

• Scaffold learning and reduce errors (Montessouri blocks)

• Show (only) differences that matter (London Underground)

• Convert slow calculation into fast perception (Map coloring)

• Support chunking, especially by experts (Chess & gestures)

• Increase efficiency (diagrams)

• Facilitate collaboration (cockpits)