Tacit knowledge management among employees with long scientific seniority within research institutions in Poland and the European Union is being discussed. The key question under analysis is: How should the tacit knowledge of employees with long scientific seniority be managed to preserve their legacy and facilitate its transfer to younger generations? As a part of a doctoral thesis, this study aims to verify and develop methods to support the management of tacit knowledge of employees with long scientific seniority in construction institutions. To achieve this, research comprising surveys and in-depth interviews will be conducted among employees of research institutions. The anticipated outcome of this study is a comprehensive method for tacit knowledge management, which includes elements such as an environment supporting knowledge transfer, cooperation techniques, and age diversity management. The insights from this research could provide a foundation for further investigation in other regions and disciplines, ultimately leading to a deeper understanding of the process of transferring tacit knowledge of senior researchers.