UCL School of Management Professor Paolo Taticchi, OMRI, along with Chiara Andreoli, Catrina Daly, Chiara Cremasco, Dr. Jan Dauman, have co-authored the second, updated version of the "Guidelines for Participatory Impact Measurement and Management" as part of the IMmPACT Research project. This report tackles the crucial issue of power imbalances in decision-making that influences the dynamics of impact projects and introduces a multi-stakeholder decision-making framework for managing impact and advocating for a systemic approach.