The importance and the impact of communication in every domain that deals with human resources is undeniable. Yet, as far as the authors' knowledge concerns, the research has been mostly developed in the human resources field. In the project management field, the research developed is still scarce. Yet, some authors emphasise the role of the project managers' communication with teams, and the importance of the project management teams on the success of projects. Therefore, this paper aims to analyse the influence of the communication styles and leadership of the project managers on the motivation of the teams and the success of projects. Literature was reviewed and exploratory research was developed using a qualitative methodology (content analysis of eight semi-structured interviews). A conceptual framework was developed. The results suggest that communication style and leadership are related and impact the teams' motivation and the projects' success.