It is just the reverse of the downward communication. It flows upward from a subordinate to the superior through middle managerial levels along the line. Such communication is of two types:
Feedback if information in which subordinates convey a message to the top executive in response to the latter's original communication.
Voluntary communication from the subordinates to convey their complaints, grievances, suggestion and opinions.
Benefits
I. Create insight into behavioral problems
II. Create confidence and trust
III. Enhance learning and excellence
Problems
I. Concealments
II. Delay and distortion
III. By passing
IV. Poor listening
V. Hesitation of employees