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In the international standard for system and software engineeringISO/IEC/IEEE 15288: 2015, the output of the stakeholder needs and the businessor mission analysis technical processes are transformed into a technical viewof the system by the system requirements definition process. In model-basedsystems engineering, functional needs can be modeled by use case diagrams.Intended outcomes of system requirements definition include resolution ofdisagreement about requirements, explicit agreement between stakeholders, andtraceability. However, stakeholder needs are often elicited in a siloed mannerand may be inconsistent. The lack of mathematically based systematic approachesfor requirements definition poses a challenge to model-based transformation ofneeds into a technical view of the system that achieves agreement betweenstakeholders. This paper specifies and demonstrates mathematical frameworks forrationalizing and synthesizing functional needs that have been captured throughan elicitation process. Benefits of this approach include but are not limitedto supporting rigorous identification and resolution of disagreements andfacilitating systematic analysis of change impact to achieve stakeholderagreement all with minimal intervention by the system engineers.

Requirements Rationalization and Synthesis enabled by Model Synchronization