Context and ObjectivesThis deliverable addresses the need for a strategy to measure and assess the impact of new ecosystems developed within the framework of the European University Initiative by the Erasmus+ program. It shifts focus from merely academic to societal impact, including benefits like environmental sustainability. The goal is to establish a unified framework for impact assessment, harmonizing quantitative and qualitative indicators for alliances while respecting each university’s unique characteristics.MethodologyThe proposed approach combines a Theory of Change framework with two observatories for internal and external evaluation, employing the Rational Unified Process (RUP) methodology. This includes a four-phase structure— inception, elaboration, construction, and transition— to enable continuous development aligned with alliance goals.Results and OutcomesA multi-dimensional observatory framework, UNITAPedia, was developed to capture and evaluate impact across six viewpoints: structural, strategic, beneficiaries, semantic, infrastructure, and data. An external observatory focuses on Sustainable Development Goals (SDGs), benchmarking against the Times Higher Education Impact Ranking, and promoting shared best practices.Impact and ApplicationsThis strategy enhances visibility for participating universities and fosters knowledge transfer, promoting innovation in impact assessment. The observatories serve as practical tools for ongoing measurement, visibility, and the collective learning of sustainable practices.Conclusions and Next StepsUNITA’s strategy incorporates a continuous improvement cycle to evolve with needs, fostering collaboration and innovation. Future directions include strengthening knowledge transfer and expanding the reach of impact assessment innovations across European universities.Keywords: impact assessment, European University Initiative, sustainability, Theory of Change, SDGs, knowledge transfer.