Open social innovation: taking stock and moving forward*

Open forms of organising innovation bear great potential to address societal challenges, such as the climate crisis.Existing approaches to open social innovation (OSI) draw on a corporate and organisationcentric open innovation model as a blueprint for addressing social and ecological problems.However, such problems are 'wicked' and 'complex' in nature and thus require concerted efforts from a diverse set of stakeholders, including businesses, government agencies, non-profits and communities.Based on a review of the open-, user-and socialinnovation literature, this essay traces the evolution from an organisation-centric view (OSI 1.0) to a multi-stakeholder, crosssectoral perspective (OSI 2.0).More specifically, we understand OSI as a concerted effort undertaken by multiple stakeholders from various sectors throughout the social innovation process, from diagnosing societal challenges, to developing ideas for how to solve problems, creating solutions, effectively scaling solutions and generating impact.We sharpen the terminology for OSI 2.0 and specify design dimensions for the effective orchestration of collaboration and coordination, and outline key areas for future research.Our objective is to foster dialogue between open-and user-innovation and social-innovation research.