The main objectives of this study are to establish how communication in medium - sized and big organizations influence the success of the process of implementation of change and how communication between the management and employees in these organizations influences the motivation of employees to carry out the change. Also, one of the goals is establishing how the communication of the managers with employees influences the implementation of the restructuring of organization and the dismissal of some employees. According to the conducted research, summarized proposals have been made on how to improve communication on the horizontal (between the employees and departments that are on the same organizational level) and vertical plan („top down“ and „bottom-up“) with the purpose of improving the implementation of change. By taking into consideration the fact that the environment in which businesses operate is constantly changing, the management must often make decisions to help the business to adapt to these changes. In this context, communication skills as well as motivation, are very important especially in managing the change in order to increase the quality of decisions and the likelihood that the employees will be motivated for the successful implementation of these changes in order to reduce the resistance to change to the lowest possible level. Based on the survey results, this study offers an overview and analysis of communication in organizations and the suggestions on how to more effectively communicate changes. The available surveys in Croatia and the world do not address the effectiveness of communication in the implementation of changes. The results obtained from the survey could be used, along with the scientific contribution, in practice (at the levels of managers and employees) to ensure a more successful implementation of inevitable changes and to reduce the probability of unwanted effects which may occur if the changes are not communicated in the right way.