Language is messy by nature, which is why we must be careful in how we use it. As leaders, after all, we have little else to work with. We typically don’t use hammers and saws, heavy equipment, or even computers to do our real work. The essence of leadership — what we do with 98 percent of our time — is communication. To master any management practice, we must start by bringing discipline to the domain in which we spend most of our time, the domain of words.