This research is concerned with factors which improve or inhibit effective communication between managers in organisations. An appraisal of the literature is carried out and a framework of the main variables affecting effective communication is suggested. This framework is tested within seven operating companies and the results discussed. Of particular interest is the finding that an individual manager's career achievement is related to the accuracy with which he communicates with his superior. The study also isolates factors affecting this accuracy and shows for example that when subordinates trust their superiors more accurate communication results, while strong desires for promotion reduce accuracy. These secondary variables are then examined to indicate how individual managers and organisations as a whole might improve their communicating effectiveness. Finally suggestions are made to develop the methods used in the present study and to point out areas which seem worthy of future research.