This study aims to better understand the importance of the phenomenon of absenteeism in public organizations, from individuals and their formal groups, labor, as more companies, whether public or private, are worrying about keeping their more efficient operations. From this perspective, we developed this study in order to clarify the influence of absenteeism in the behavior of Campus Basin Unit groups in the construction and assembly department, Petrobras. In addition, this study was developed through exploratory and descriptive qualitative analysis, so it was used as a research tool the interview script, so the author of the study concluded that absenteeism affects the behavior of groups formal and thus influences the development of internal processes, because it creates delays in the production of administrative activities, particularly in the order of various documents of tax analysis and projects of oil platforms, thus generating some kind discomfort among the work team and changes in management decisionmaking in the work team management.