Implementation of a Goal-Based Systems Engineering Process Using the Systems Modeling Language (SysML)

Breckenridge, Jonathan T.; Johnson, Stephen B.

doi:10.2514/6.2013-4577

Cited by 4 publications

(18 citation statements)

References 3 publications

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“…The set of available literature for GFTs was significantly smaller than for value modeling due to GFT's recent introduction and limited use, predominantly by NASA. Four sources as of January 2019 were identified for GFTs [4], [6], [68], [69]. The types of literature identified were journal articles, conference papers, and technical reports.…”

Section: A Content Analysis: Defining Terminology and Creating Defini...mentioning

confidence: 99%

“…The twenty-five most frequent words for each literature set are included in Appendix C. From these frequent words lists, the elements of the models were identified. Tables 1 and 2 present the elements, compiled definitions from statements in the sources, and corresponding references for value models [3], [12], [16], [20], [31]- [33], [35], [38], [47], [56]- [67] and GFTs respectively [4], [6], [7], [68]. If a definition was identified in the sources, it appears in Tables 1 and 2.…”

Section: A Establishing Value Model and Gft Terminologymentioning

confidence: 99%

“…[4] A top-down functional decomposition of system goals and functions, arranged by major system phase/configuration; to define what functions the system must perform for the system to successfully perform its mission/objectives. [68] A hierarchical, branched representation of a system's goals and objectives, specified in success space. [69] Applies a hierarchy of goals and requirements linked to stereotypes that sequentially allows for traceability throughout the model.…”

Section: Goal-function Treementioning

confidence: 99%

“…[4] Inputs and outputs to a system's functions; they are the connection between function and design. [68] Physical attribute of a system that must be maintained within an appropriate range for the success of the assigned goal. [69] Attributes that are controlled and that have a specified range for operational success in the function.…”

Section: Goal-function Treementioning

confidence: 99%

“…[4] A realization of an associated goal that transforms one or more input state variables into a different set of output state variables. [68] Representation of the change from one state variable, or set of state variables, into another through the function, as in the equation. [69] Determines success or failure, removing ambiguity from the system.…”

Section: Goal-function Treementioning

confidence: 99%

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The Relationship Between Goal-Function Trees and Value Models

Eaton

Mesmer

2023

IEEE Open J. Syst. Eng.

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Systems often inspire the development of new models to manage size and complexity challenges in system development. Engineers should be aware of overlap in the models used for systems engineering of systems as it would be inefficient to reiterate overlapping tasks. The objective of this paper is to identify consistencies between two models that appear to have overlapping tasks: Goal-Function Trees (GFTs) and value models. Both models are perceived to represent information about the system and stakeholder preferences, but have historically used differing processes and language. An analysis of the functional use and terminology for the two models reveals consistencies. The two models are compared in this paper using content analysis of systems engineering academic literature. It is seen that physics-based system representation and stakeholder preference incorporation are often common to both models. A coffee maker is used to illustrate the potential consistencies and overlapping tasks between the models. Extending this simple example, the applicability of the models to space systems is discussed. The findings of this article can be used by systems engineers to improve their efficiency when applying both GFTs and value models.

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Section: A Content Analysis: Defining Terminology and Creating Defini...mentioning

confidence: 99%

Section: A Establishing Value Model and Gft Terminologymentioning

confidence: 99%

Section: Goal-function Treementioning

confidence: 99%

Section: Goal-function Treementioning

confidence: 99%

Section: Goal-function Treementioning

confidence: 99%

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The Relationship Between Goal-Function Trees and Value Models

Eaton

Mesmer

2023

IEEE Open J. Syst. Eng.

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Utilization of Goal Function Trees for Robust Requirements Definition

Gethers

Thomas

2018

INCOSE International Symp

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This paper describes the implementation of the Goal Function Tree (GFT) for an Unmanned Aerial Vehicle (UAV) in a Systems Modeling Language (SysML) environment which tracks nominal and off nominal goals for a successful flight of a UAV. The utility of the GFT enables the traceability of the system's goals and requirements to perform a successful mission scenario. Definition of nominal goals reduces ambiguity about mission success and can be followed more easily by the customer. Furthermore, the Goal Function Tree can also track and implement corrections if the measurements for success are deviating through the use of off nominal functions. The GFT's off nominal functions create a new set of functions and goals that attempt to mitigate a failing attribute instead of the other methods that only defined failure. This methodology creates a set of procedures for an operator or system when action is needed, thereby identifying more robust requirements as compared to traditional requirements development based only on nominal mission scenarios. The advantage of the SysML environment enables the legible traceability of the overlapping of goals of various structural and behavioral system objects, the execution of functions, and implementation of stereotypes which classifies the interactions between objects.

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