The immediate superior role has been identified as very significant for the success of organisations. According to research, the positive impact of psychological safety for the team and the organisation has also been identified as undeniable. The actions and role of the immediate superior are significant for creating psychological safety in teams. Despite these research findings, supervisors often operate with inadequate training and support. Organisations do not appear to recognise the issue, and resources are not directed to support superiors' work. The aim of the thesis was to get clarity about the methods supervisors use to develop the work community and how these methods correlate with the promotion of psychological safety. In addition, the aim was to find out what kind of support supervisors need for developing the work community. The thesis was carried out during 2021 as a survey for the supervisors of a Finnish organisation. The survey was answered by 95 supervisors of the organisation. It provided information about the existing methods and practices, challenges and needs for support related to the development of the work community and atmosphere in the team. The results confirmed the findings of previous studies: that supervisors operate under many expectations and pressures, and with a lack of support. The study also revealed that psychological safety was not familiar to the supervisors involved in the study. Other methods common to all supervisors could not be identified from the results of the study. As in previous studies, the results confirmed that supervisors operate primarily on their own development skills and abilities. Competencies and abilities vary significantly between supervisors too. In light of previous research, psychological safety appears as a potential method for developing work communities and work atmosphere. However, the conclusion is that the existing guidelines and tools available are not at a sufficiently concrete level. Supervisors need a concrete, simple and effective tool to implement the principles of psychological safety in a busy work routine on a daily basis. It can also be concluded from the thesis research that supervisors lead work in very different situations and with different capabilities. For this reason, the implementation of psychological safety in teams should consider the different situations and capabilities of superiors. The development proposal in the thesis is a model to find out the starting point in the organisation and to create ways of providing comprehensive and effective support for the implementation of psychological safety and for development of supervisory work in the organization.