Communication constitutes an essential aspect of teamwork. This is especially true for audit teams, where communication takes place not only within the work group but also with the audit recipients. For this reason, given the poor evidence in the literature, communication training was carried out on an audit team. Training was divided into 10 meetings of two hours each, with the meetings taking place over 2 months. Questionnaires were administered to identify the characteristics and styles of communication, to assess the sense of perceived self-efficacy in general and at work, and to evaluate the knowledge inherent in the communication. This battery was administered before and after the training to evaluate its effectiveness and its effects on self-efficacy, communication style, and knowledge. Furthermore, a communication audit was performed on the feedback provided by the team, to highlight satisfaction, strengths, and any critical issues that emerged during the feedback phase. The results obtained suggest that training has an effect not only on individual knowledge but also on personological aspects. Communication among colleagues and general self-efficacy appear to be improved by the process. Self-efficacy also specifically improves in the work environment, with subjects feeling more able to manage relationships and collaborations with colleagues and supervisors. Moreover, the audit team members were satisfied with the training received, perceiving an improvement in their own communication skills during the feedback phases.