  Traditional requirements engineering tools do not readily access the
SysML-defined system architecture model, often resulting in ad-hoc duplication
of model elements that lacks the connectivity and expressive detail possible in
a SysML-defined model. Without that model connectivity, requirement quality can
suffer due to imprecision and inconsistent terminology, frustrating
communication during system development. Further integration of requirements
engineering activities with MBSE contributes to the Authoritative Source of
Truth while facilitating deep access to system architecture model elements for
V&V activities. The Model-Based Structured Requirement SysML Profile was
extended to comply with the INCOSE Guide to Writing Requirements updated in
2023 while conforming to the ISO/IEC/IEEE 29148 standard requirement statement
templates. Rules, Characteristics, and Attributes were defined in SysML
according to the Guide to facilitate requirements definition and requirements
V&V. The resulting SysML Profile was applied in two system architecture models
at NASA Jet Propulsion Laboratory, allowing us to explore its applicability and
value in real-world project environments. Initial results indicate that
INCOSE-derived Model-Based Structured Requirements may rapidly improve
requirement expression quality while complementing the NASA Systems Engineering
Handbook checklist and guidance, but typical requirement management activities
still have challenges related to automation and support with the system
architecture modeling software.
