When the communication is from the superior to subordinates it is referred to as downward communication.
nizational Communication is the process whereby an organizational stakeholder (or group of stakeholders) attempts to stimulate meaning in the mind of another organizational stakeholder (or group of stakeholders) through the intentional use of verbal, nonverbal, and/or mediated messages.
Written communication occupies an important position in the communication sphere, so written communication has to pay adequate attention to certain principles of necessity. The essentials of every written communication are principles of unity, coherence and emphasis. These principles along with other essentials of effective communication, like language, planning and organization make written communication effective.