book

Systems Engineering Demystified

by Jon Holt

January 2021

Intermediate to advanced

468 pages

11h 3m

English

Packt Publishing

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A brief history of systems engineeringDefining systems engineeringDefining a systemCharacteristics of a systemDefining systems engineeringThe need for systems engineeringComplexityThe complexity of constraintsCommunicationUnderstandingThe implementation of systems engineeringSummaryQuestionsReferences
An introduction to MBSEAbstracting the systemVisualizing the modelDefining the approachGrouping the MBSE conceptsImplementing the notationShowing compliance Using MBSEThe evolution of MBSEStage 1 – document-based systems engineeringStage 2 – document-centric systems engineeringStage 3 – model-enhanced systems engineeringStage 4 – model-centric systems engineeringStage 5 – MBSECross-cutting concernsModeling with MBSEThe need for modelingDefining the modelTwo aspects of the modelWhen and where to modelThe spoken language – the Systems Modeling Language (SysML)What SysML is (and what it is not)The SysML diagramsExample structural modelingExample behavioral modelingThe domain-specific language – the ontologyUnderstanding the ontology – the cornerstone of MBSEVisualizing the ontologySummarySelf-assessment tasksReferences
Defining systemsDemonstrating consistency between the ontology and system hierarchyDefining the system hierarchyDefining interaction relationshipsDescribing interfacesIdentifying interfacesDefining interfacesModeling interfacesModeling behavioral views for interfacesDefining the frameworkDefining the viewpoints in the frameworkDefining the framework context viewDefining the ontology definition viewDefining the viewpoint relationship viewDefining the viewpoint context viewDefining the viewpoint definition viewDefining the ruleset definition viewSummarySelf-assessment tasksReferences
Defining life cyclesDefining life cycle conceptsDefining life cycle modelsDefining a linear life cycle modelDefining an iterative life cycle modelDefining an incremental life cycle modelInteracting life cycles and life cycle modelsIdentifying interactions between life cyclesDefining the behavior of interactionsDefining the frameworkDefining the viewpoints in the frameworkDefining the framework context viewDefining the ontology definition viewDefining the viewpoint relationship viewDefining the viewpoint context viewDefining the viewpoint definition viewDefining the ruleset definition viewSummarySelf-assessment tasksReferences
Understanding process fundamentalsDefining process propertiesDefining process typesProcess conceptsProcess modelingDefining the process contextDefining the process libraryDefining the process stakeholdersDefining the process artifactsDefining the process behaviorDefining a sequence of processesModeling standards using process modelingIdentifying systems engineering standardsModeling ISO 15288Demonstrating compliance with ISO 15288Defining the frameworkDefining the viewpoints in the frameworkDefining the framework context viewDefining the ontology definition viewDefining the viewpoint relationship viewDefining the viewpoint context viewDefining the viewpoint definition viewDefining the ruleset definition viewSummarySelf-assessment tasksReferences

Introducing needs and requirementsDefining needsVisualizing needs using different SysML diagramsVisualizing source elementsVisualizing need descriptionsVisualizing the context definitionVisualizing contextsVisualizing scenariosLife cycle and processesDefining the frameworkDefining the viewpoints in the frameworkDefining the Framework Context ViewDefining the Ontology Definition ViewDefining the Viewpoint Relationship ViewDefining the Viewpoint Context ViewDefining the Viewpoint Definition ViewDefining the Ruleset Definition ViewSummarySelf-assessment tasksReferences
Defining designsArchitectural designDetailed designDefining logical model elementsDefining functional model elementsDefining physical elementsDefining system behavior Complying with best-practice processesComplying with the ISO 15288 architecture definition processComplying with the ISO 15288 design definition processDefining the frameworkDefining the viewpoints in the frameworkDefining the framework context viewDefining the ontology definition viewDefining the viewpoint relationship viewDefining the viewpoint context viewDefining the viewpoint definition viewDefining the ruleset definition viewSummarySelf-assessment tasksReferences
Defining testing conceptsModeling verification and validationModeling the testing contextModeling the testing setupModeling the testing configurationUsing existing views for testingComplying with best-practice processesComplying with the ISO 15288 Verification ProcessComplying with the ISO 15288 Validation ProcessDefining the frameworkDefining the viewpoints in the frameworkDefining the framework context viewDefining the ontology definition viewDefining the viewpoint relationship viewDefining the viewpoint context viewDefining the viewpoint definition viewDefining the Ruleset Definition ViewSummarySelf-assessment tasksReferences
Introducing methodologiesIntroducing SAFeDefining the SAFe conceptsDefining the SAFe core conceptsDeploying SAFeSummarizing the SAFe methodIntroducing OOSEMDefining OOSEM conceptsDefining the OOSEM approachSummarizing the OOSEM methodMethodologies and MBSEMethodologies and approach Methodologies and goalsMethodologies and visualizationMethodologies and implementationMethodologies and complianceSummarySelf-assessment tasksReferences
Introducing managementThe project planning processApplying modeling to the activate the project activityApplying modeling to the define the project activityApplying modeling to the plan project and technical management activitySummary of the project planning processThe decision management processApplying modeling to the prepare for decisions activityApplying modeling to the analyze the decision information activityApplying modeling to the make and manage decisions activitySummary of the decision management processThe project assessment and control processApplying modeling to the plan for project assessment and control activityApplying modeling to the assess the project activityApplying modeling to the control the project activitySummary of the project assessment and control processThe risk management processApplying modeling to the plan risk management activityApplying modeling to the analyze risks activityApplying modeling to the manage the risk profile activityApplying modeling to the monitor risks activityApplying modeling to the treat risks activitySummary of the risk management processThe information management processApplying modeling to the prepare for information management activityApplying modeling to the perform information management activitySummary of the information management processThe configuration management processApplying modeling to the plan configuration management activityApplying modeling to the perform configuration identification activityApplying modeling to the perform configuration change management activityApplying modeling to the perform configuration status accounting activityApplying modeling to the perform configuration evaluation activityApplying modeling to the perform release control activitySummary of the configuration management processThe measurement processApplying modeling to the prepare for measurement activityApplying modeling to the perform measurement activitySummary of the measurement processThe quality assurance processApplying modeling to the prepare for quality assurance activityApplying modeling to the perform product or service evaluations activityApplying modeling to the perform process evaluations activityApplying modeling to the treat incidents and problems activityApplying modeling to the manage quality assurance records and reports activitySummary of the quality assurance processSummarySelf-assessment tasks
Introducing key standardsISO 15288 – Systems and software engineering life cycle processesOther standardsIntroducing key guidelinesThe INCOSE Competency FrameworkOther guidelinesOrganizationsSummary
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Content preview from Systems Engineering Demystified

Chapter 6: Needs and Requirements

This chapter focuses on introducing one of the most important techniques associated with MBSE, that of modeling needs and requirements.

Understanding needs is crucial to the success of any system as they provide the definition of all aspects of the system, such as the intended use, performance, function, form, and intent of the system.

Without understanding the needs of a system, it is impossible to say whether the delivered system is fit for purpose. This is because the purpose of that system is not known, as it is the needs that describe its purpose. Therefore, it is crucial that all needs are well defined and also that they are well understood by all of the stakeholders of the system. This is important as ...