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In this paper we argue that there is a scarcity of methods which support critical, systemic, long-term thinking in current design practice, technology development and deployment. To address this need we introduce value scenarios, an extension of scenario-based design which can support envisioning the systemic effects of new technologies. We identify and describe five key elements of value scenarios; stakeholders, pervasiveness, time, systemic effects, and value implications. We provide two examples of value scenarios, which draw from our current work on urban simulation and human-robotic interaction . We conclude with suggestions for how value scenarios might be used by others.