The Johari Window: A Guide for Leaders by Sheril Mathews is a very helpful post for leaders about a model I wasn’t familiar with:

The Johari Window is a 2×2 matrix that captures how we communicate based on self-knowledge and how others see us. It’s a disclosure-feedback model of awareness based on principles of feedback and learning. It can be used for increasing levels of openness, self-awareness, and self-understanding. This makes the Johari Window a particularly relevant tool for leaders and managers.

Sheril goes on to explain the model in detail, and how to increase the size of the top left corner of the matrix, called “The Arena”:

This is the public space. It’s the part of ourselves—behaviors and feelings—that we’re aware of, and so are others. All information is known to all parties. We move freely within this space and it fosters open communication.