Model-Based Requirements Engineering: Architecting for System Requirements with Stakeholders in Mind

Specifying system requirements (SysReqs) is a critical activity in complex systems development. The SysReqs and emerging architecture are constructed through gradual and iterative transition from the problem domain and operational stakeholder requirements to the conceptual solution domain. They later constitute the basis for functional requirements elaborating, concept formation, technology selection, function-to-form allocation, and asset utilization. Only rarely can stakeholder requirements (SHRs) readily translate to SysReqs. Systems engineers must therefore elicit, analyze, and evolve the SysReqs, as these will radically affect the system's performance, robustness, endurance, and appeal. Model-Based Systems Engineering (MBSE) provides a framework for effective and consistent systems engineering and architecting. MBSE relies on modeling languages, such as Object-Process Methodology (OPM). OPM is a holistic MBSE paradigm and language for complex systems and processes, standardized as ISO 19450, which relies on the principle of minimal universal ontology. In this paper, we propose a modelbased requirement engineering (MBRE) approach to facilitate the transition from SHRs to SysReqs, and from SysReqs to system architecture specification. We demonstrate the applicability of this framework in architecting a robotic baggage loading system for a leading international airport.