Ans: A person working at higher level of authority in his organization may be required to correspond with a person working at lower level or vice versa; this is called as diagonal communication. It may be internal or external communication. It does not follow any set pattern like vertical and horizontal communication.
Example: 1) General Manager of Shah Textiles corresponds with the Sales Manager of Raymond International. 2) In a seminar, Production Manager communicates with the workers, supervisors and General Manager