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Developing a sustainability non-functional requirements framework

Requirements engineers are in a unique position to encourage the consideration of sustainability at a formative phase in the software development life cycle. In this paper, we look at how we can develop sustainability as a non-functional requirement (NFR). We describe an NFR framework that is informed by sustainability models and discuss how it can be used to appropriately elicit and describe sustainability related requirements of the software system to be developed. We outline a roadmap for how we may integrate sustain- ability in requirements engineering from a theoretical NFR framework to an applicable software quality and relevant software standards.