International audienceThe digital creative industries exemplify innovation processes in which user communities are highly involved in product and service development, bringing new ideas, and developing tools for new product uses and environments. We explore the role of user communities in such co-innovation processes via four case studies of interrelations between firms and their communities. The digitization and virtualization of firm/community interactions are changing how boundaries are defined and how co-innovation is managed. The transformation of innovation management is characterized by three elements: opening and redefining firm boundaries; opening of products and services to community input and reducing property rights; and reshaping organization and product identities. Innovation in collaboration with user communities requires firms to orchestrate their communities and their inter-relationships to encourage the creativity and motivation of users, and develop the community's innovatory capacity

Today, innovating with a user community seems an effective strategy for developing a firm's innovation capacity. However, short-term benefits from this collaboration are no longer sufficient, and firms are now looking to develop a sustainable relationship with users, to maintain sustainable innovation. This study furthers our understanding of the way in which a user toolkit connected to a community serves to manage innovation of an existing product or service. The literature provides a limited understanding of the role of a user toolkit in the management of a sustainable innovation approach in firms. The research is based on a longitudinal case study of the video game Trackmania, which has an integrated toolkit connected to a large and active user community. Results confirm the crucial role of the toolkit in the construction, control and maintenance of a sustainable innovative approach with a user community. From the innovation perspective, the toolkit can be considered as a means of managing the boundary between the firm and the user community, because it enables the community to structure itself as a multi-sided platform, where all categories of users participate in value creation. Finally, we identify four modalities for managing sustainable innovation with a user community toolkit.

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