Charlene Li shares her thoughts on the essential features and value of 'Open Leaders'. To explain the concept, she puts people in the (familiar) 2x2 matrix, with Collaborative or Independent on one axis, and Pessimist or Optimist on the other. Simple matrixes like this are effective because they engage both visual and traditional readers, even if there's a risk of over-simplification.
These give 4 different types of leaders:
Cautious Tester (a Collaborative Pessimist)
Worried Sceptic (an Independent Pessimist)
Transparent Evangelist (an Independent Optimist)
Realist Optimist (a Collaborative Optimist)
Here's a short video in which she explains the model: