The aim of the thesis is to analyze the importance of understanding interest-influence groups in projects, identify key strategies and practices from the aspect of effective relationship management, and examine examples from the real world that illustrate the advantages and challenges in managing relationships with interest-influence groups. This thesis thoroughly explores the key aspects and importance of successfully managing relationships with key project stakeholders. Such relationships are essential for the management and successful implementation of projects because they include all groups that have a certain interest or influence on the project. The research makes it possible to acquire a more concise assumption about the importance of effective management of these relationships and shows how only thorough understanding, precise identification and strategic management of diverse groups of individuals and organizations whose interests or influences shape the project can result in success. The paper explores in detail the initiative for the establishment of intermediary companies that will connect producers of natural gluten-free products with retail customers, placing emphasis on a thorough analysis of interest-influential key groups and an assessment of the level of their influence on the success and effectiveness of the project's verification. When creating the work, different methods of scientific research work are used, such as the method of description, the method of analysis and synthesis, inductive and deductive methods, classification methods, comparative methods and generalization methods.