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The authors present an approach for integrated elicitation and specification of functional requirements (FRs), non-functional requirements (NFRs) and architecture options (AOs) that addresses the challenges of adequate abstraction levels, different stakeholder views, identification of dependencies among requirements and compact description of the solution space. The approach includes a quality model, checklists and a template for documenting NFRs, as well as the use of use cases and architecture to ensure completeness and ease traceability. The method has been used in a case study with Siemens and a workshop with practitioners, and received positive feedback for its systematic approach to eliciting NFRs and capturing experience. The authors also mention related work in requirements engineering, architecture design, and performance engineering.