5.1.3 Requirements Completeness

Noel

2018

Self Cite

The Verification and Validation of requirements are formalized using decomposition and set theory to yield four elemental criteria, verifiability, feasibility, necessity, and sufficiency, which are derived from definitions of requirements “verification” and “validation”, and “correct and complete” requirements. These criteria are mapped to the fourteen characteristics of requirements in the INCOSE Guide to Writing Requirements. Requirements parent‐child relationships are established for the verification and validation (V&V) criteria at multiple levels of a system architecture, from user needs to component requirements. Using these V&V criteria during the requirements development process would enable improved first‐pass success and less rework caused by revisiting missing, incomplete, incorrect or unnecessary requirements.

Section: Sets Of Requirementsmentioning

confidence: 99%

Section: Necessary and Sufficientmentioning

confidence: 99%

Section: Correct Sets Of Correct Requirementsmentioning

confidence: 99%

See 1 more Smart Citation

Formalizing Requirements Verification and Validation

Noel

2018

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“…The size can be assessed in terms of the number of requirements, and the process measures can address the number vs. time or per plan. The expected size can be evaluated using the techniques developed by (Carson et al 2004) or other methods.…”

Section: Application To Incose Se Handbook Outputsmentioning

confidence: 99%

Correlating Product and Process Measures as a Model for Systems Engineering Measurement

2011

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Abstract. Current measurement industry emphasis on process measures and compliance ignores elements of the history of measurement. The failure to establish product measures and provably correlate them with process measures leads to open-loop management systems that can only measure process compliance, with unknown effect on product quality. The new INCOSE Measurement Primer attempts to begin addressing this important distinction. In this paper a set of standard categories of measures are applied to various Systems Engineering work products identified as "output" in the INCOSE SE Handbook. Process and product measures for each process output are proposed, along with correlations between them, and associations to the INCOSE SE Leading Indicators where applicable.

“…The closed-loop feedback control model then requires direct measures of the quality and completeness of the requirements as the first step of process control. The completeness of sets of requirements has already been addressed by (Carson et al 2004).…”

mentioning

confidence: 99%

Implementing Structured Requirements to Improve Requirements Quality

2015

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The Boeing Company has implemented a standard approach to the engineering of high-quality requirements using the concept of "structured, natural language", a specific grammar for how to write requirements. This approach helps our requirements engineers write more unambiguous and verifiable requirements as required by ISO/IEC/IEEE 29148:2011 and related commercial and military standards.Boeing has identified four types of specification requirements, plus a verification requirement type. Each type of requirement has a standard grammar, a set of mandatory and optional elements that ensure verifiability related to the type. This approach is implied by recent guidance from the International Council on Systems Engineering (INCOSE), and by recommendations of other industry practitioners.In combination with these standards for writing requirements we have also integrated a scoring method for evaluating how well any requirement satisfies the standard criteria. This approach provides immediate feedback to the requirement writer regarding the absence of critical information or deficiencies in the information provided, e.g., unobservable functions, or ambiguous performance criteria or conditions. In contrast with other industry methods we score elements of the requirement individually on a graded (rather than binary) scale. We are thus able to not only score for the presence or absence of a required element, but are able to identify degrees of compliance with the Boeing standard. This enables us to quantify the risk of less-than-perfect requirements.The updated INCOSE SE Measurement Primer (INCOSE 2010) describes SE measurement as a closed-loop feedback control system (Figure 1). For requirements development, the specific process outputs or work products are the requirements themselves in their various specifications. The closed-loop feedback control model then requires direct measures of the quality and completeness of the requirements as the first step of process control. The completeness of sets of requirements has already been addressed by (Carson et al. 2004).