Systems Modeling & Simulation Working Group

The following was compiled by members of the Systems Modeling & Simulation Working Group to provide the model-based systems engineering community with a common set of shared terms and definitions.

A-C | D-F | G-I | J-L | M-O | P-R | S-U| V-X | Y-Z

Terms & Definitions (S-U)


Term Definition Source
Simulation Data Management (SDM) A technology which uses database solutions to enable users to manage structures of simulation and process data across the complete product lifecycle. SDM artifacts can be data, models, processes, documents and metadata relevant to modeling, simulation, and analysis. NAFEMS SDMWG
Simulation Exercise An exercise that consists of one or more interacting simulation applications. (IEEE Std 1278.1-2012) Modeling & Simulation Coordination Office
Simulation Time The shared time being simulated within a simulation exercise; it may advance faster, slower, or at the same pace as real time. (IEEE Std 1278.1-2012) Modeling & Simulation Coordination Office
SMS Tools Software and / or hardware that implements and / or enables a model, simulation, activities or an adjunct tool, i.e., software and/or hardware that is either used to provide part of a simulation environment (e.g., to manage the execution of the environment) or to transform and manage data used by or produced by a model or simulation. Adjunct tools are differentiated from simulation software in that they do not provide a virtual or constructive representation as part of a simulation environment. SMSWG
SMSWG The Systems Modeling & Simulation Working Group (SMSWG) was established through a collaborative partnership between NAFEMS and INCOSE. The SMSWG defines best practices and standards for vendors to develop and manufacturers to follow the merging of engineering analysis with the overall systems behavior analysis to perform more realistic, accurate, and lifelike experiences. SMSWG
Software-in-the-Loop Testing (SiL) In software-in-the-loop testing, the actual Production Software Code is incorporated into the mathematical simulation that contains the models of the Physical System. This is done to permit inclusion of software functionality for which no model(s) exists, or to enable faster simulation times. ANL 2012 / SEBoK
Stage a period within the life cycle of a system that relates to the state of the system description or the system itself ISO/IEC 2008
Stakeholder Individual or organization actively involved in a project / activity, or whose interests may be affected, either positively or negatively, as a result of project / activity execution or successful project / activity completion.
Stakeholder Requirements Formally documented and approved stakeholder requirements that will govern the project, including: required system capabilities, functions, and/or services; quality standards; and cost and schedule constraints. INCOSE
Static Model A model of a system in which there is no change over time. Modeling & Simulation Coordination Office
Subsystem A system element comprising an integrated set of assemblies, which performs a cleanly and clearly separated function, involving similar technical skills, or a separate supplier. (Examples are an aircraft on?board communications subsystem or an airport control tower as a subsystem of the air transportation system.) INCOSE
System An integrated set of elements, subsystems, or assemblies that accomplish an objective (defined or undefined). These elements include products (hardware, software, firmware), processes, people, information, techniques, facilities, services, and other support elements
System Architecture Description Description of the system architecture, typically presented in a set of architectural views, along with documented justification for concept selections. INCOSE
System Boundary A distinction which marks the difference between a system and its environment. SEBoK / Checkland
System Element A member of a set of elements that constitutes a system, a major product, service, or facility of the system, e.g. the aircraft element of an air transportation system (the term subsystem is sometimes used instead of element). ISO/IEC 2008
System Life Cycle The evolution with time of a system-of-interest from conception through to retirement
System Model A representation of a system. Modeling & Simulation Coordination Office
Systems Modeling and Simulation

The use of interdisciplinary functional, architectural and behavioral models (physical, mathematical, or logical representations) in performing MBSE to conceptualize, design, analyze, and validate an organized set of components, subsystems, systems, and processes.

System-of-Systems System of systems applies to a system-of-interest whose system elements are themselves systems; typically these entail large scale inter-disciplinary problems with multiple, heterogeneous, distributed systems. Airbus
Systems Engineering Systems Engineering (SE) is an interdisciplinary approach and means to enable the realization of successful systems. It focuses on defining customer needs and required functionality early in the development cycle, documenting requirements, and then proceeding with design synthesis and system validation while considering the complete problem. Systems Engineering considers both the business and the technical needs of all customers with the goal of providing a quality product that meets the user needs. [INCOSE] INCOSE / Airbus