Improved organizational communication

Good evening, I am working on how to increase better communication both horizontally and vertically in an organization. Within the case I was looking at was Fannie Mae, their organization contained multiple communication failures- mostly all communication dealing with accounting (ex. poor communication vertically and horizontally (from employees to senior managers to the board), omission in communication to board members, misleading communication given to board members, etc.). I need to find 3 or 4 ways in which communication could be improved. Does an OTA have any suggestions?