specialties or multidisciplinary skills, who are responsible for carrying out all the phases of a program or project from start to finish . For the purposes of this study, ‘cross-functional communication’ refers to communication between the project team members, rather than to communication between groups of people with different functional specialties. Discussion Communication is the most relevant factor to implement the project. The other critical success factors found were: project communication, consulting the client, acceptance from the client, support from the upper management, project schedule, and mission of the project, project execution, troubleshooting, staff management, monitoring, and control. Communication in the projects was the most important critical success factor in large companies, while the most critical one for small companies. All pieces of evidence in this research support the idea that individuals who not only have the technique, but also knowledge management, leadership, and ability, lead successful projects. The most critical factors were the managerial ones, however, the abilities andexperiences in management helped the project to be successful. Communication Skills is very important for the success of the project. Communication skills of the project managers are not always perfect, they can be always improved. The success of any project depends on the quality of project managing mechanism. The project managers should understand all the relevant factors to understand the whole communication process. Each project should have a good communication plan. A project will have its own method or a process or it might be like another project. Poor communication of the project managers with the stakeholders will have a serious impact on the success of the project. Poor communication could be the following.>