Communicating is a process competency. Even if you can do the other two competencies (diagnosing and adapting - see blog posts from 5.24.13 and 5.28.13), you need to communicate effectively. If not, it is unlikely you will meet your goal.
We will be discussing the importance of communication much more in later blog posts. For now, it is important to keep in mind that the successful leader meets two goals in the communication process: influence and effectiveness. The leader can measure the influence of communication through the amount of action or change in the receiver caused by the message. The fit between the message received and the readiness of the receiver to accept it will determine whether the leader exerts positive or negative influence. Effectiveness can be evaluated by how closely the influence of the message reflects the intentions of the sender: In other words, is the receiver influenced in the manner intended by the leader? Effectiveness, therefore, is a measure of the reception coupled with understanding.