This thesis aims at tackling an important issue in the communication management of multi-organizational international projects. Furthermore, it focuses on the importance of effective communication in the planning stage of this kind of projects. The literature review shows the importance of effective communication among the different stakeholders at this stage of the project planning in the life cycle of such projects in particular. The empirical data received through interviews of three projects of this kind supports the literature about the importance of effective communication at this stage of the project since the lack of effective communication at this planning stage increases the chances of the failure of the whole project.