SIMPACT advances understanding of social innovation’s economic dimensions, creating new concepts, models and instruments for policy makers, innovators, investors and intermediaries. It systematically investigates how social innovations can enable the most vulnerable in society to become economic assets, integrating critical analysis of current and previous work with future-oriented methodologies, new actionable knowledge and continual stakeholder participation.SIMPACT’s multidisciplinary mixed-method approach advances knowledge and the state of the art by (i) elaborating a theoretical model of the economic dimensions of social innovation throughout its lifecycle; (ii) generating new empirical knowledge on the economic dimensions through rich, theoretically informed analysis of successful and less successful cases; (iii) analysing drivers and barriers shaping the economic impact of social innovations, and levers for their scaling and diffusion; (iv) developing indicators to measure social innovations and tailored methods to evaluate social and economic impact; (v) enhancing modes of public policy production, instruments and guidelines; (vi) generating foresight knowledge through agent-based modelling and scenario building.SIMPACT integrates theoretical, empirical and actionable knowledge to create evidence-based approaches to business development, public policy and research. A participatory research approach actively engages policy makers, innovators, investors and intermediaries of vulnerable groups. Action learning, indicator labs and stakeholder experiments facilitate processes of co-creation, stimulating shared learning, strengthening practitioner knowledge and enhancing conceptualisation of the economic base. Partners' understanding of welfare regime diversity, including New Member State specificities, will ensure tailored, actionable deliverables. Eight high profile associate partners will help ensure the success of SIMPACT’s dissemination activities.