System Acceptability in .NET

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System Acceptability
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Normalized Cost Per Unit
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1.3 1.0 0.8 0.5 0.3
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Minimum Acceptable Performance Solution 4 is Non-Compliant with MAXIMUM Cost Per Unit Criteria Design-to-Cost (DTC) Level
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Solution 1 is Technically Non-Compliant with MINIMUM Performance Criteria
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Normalized Technical Performance
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Where: X = Candidate Solutions
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Figure 6.1 Cost as an Independent Variable (CAIV) plot for making cost-capability decisions
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tives at risk. Are these concepts important to retailer companies doing business on the World Wide Web You, bet! Especially from a User interface, security, and billing perspective. Is system effectiveness important in educational and training systems A resounding Yes!
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The subject of system acceptability is often abstract and is OPEN to INTERPRETATION to different people. WHAT constitutes acceptability to one User may not be acceptable to another User. Our discussion of system operational utility, suitability, and effectiveness ultimately in uences the User s decision as to whether the system satis es their operational needs. The degree of satisfaction for a given system application establishes user perceptions concerning whether they procured the RIGHT system. We refer to this as system validation. System validation draws yet another question: If the Users have a vision of WHAT they WANT, HOW do they: 1. Translate the vision into a speci cation to produce the visionary system 2. Have a level of con dence that the system, product, or service delivered will be that RIGHT system 3. Be able to reproduce multiple copies of the system The rst question requires the engineering of the system. The second question requires building integrity into the evolving engineering of the system to ensure that the source requirements manifest themselves in the design of the deliverable system, product, or service and can be demonstrated at system delivery to be satis ed. We refer to this as system veri cation. The third question requires that the engineering of the system establish high-quality documentation and process standards that enable skilled workers to reliably and predictably reproduce each copy of the system, product, or service within speci ed performance constraints. Let s focus our attention brie y on the concepts of system validation and system veri cation. Figure 6.2 provides an illustration of system veri cation and system validation that helps in better understanding these concepts.
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6.7 System Veri cation and Validation (V&V)
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Operational Need
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Did We Acquire the Right Product Did We Acquire the Right Product
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System Validation System Validation
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Acquirer User System Developer Services Provider
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Multi-Level Specifications
Did We Build the Product Right Did We Build the Product Right Highly Iterative
System Verification System Verification
Highly Iterative
System Analysis, Design, & Development System Analysis, Design, & Development
Figure 6.2 Veri cation & Validation (V&V) Concept Overview
Operational Need
Beginning in the upper left corner of the gure, Users have operational needs related to their assigned organizational and system missions. Later we will discuss the context of this operational need in terms of a problem space or and solution space. To satisfy this operational need, the User must translate the operational need requirements into a speci cation that is legally suf cient for procurement. Since the creation of the speci cation requires specialized expertise provided by subject matter expert (SME) SEs, the User s organization may lack this capability. Where this is the case, the User may employ the services of an Acquirer organization to serve as their technical and contractual representatives.
System Veri cation
Throughout the development of the multi-level speci cations, the Acquirer and User must answer the question: Are we specifying the RIGHT system that will satisfy the User s operational need This is an Acquirer-User process that is highly iterative until the requirements reach a state of maturity suf cient for initiating a procurement action. Once the procurement action begins, the formal Request for Proposal (RFP) solicitation process for a system provides additional insights, such as from proposals by System Developer candidates concerning the RIGHT system from an objective, technical perspective. The formal RFP solicitation process culminates in the award of a system development or procurement contract. Once the contract is awarded, the challenge becomes: HOW do we ensure that the system will be built RIGHT that is, correctly in accordance with the contract speci cation The Acquirer, User, and System Developer must answer this question mainly through a series of technical reviews, technical demonstrations, and risk assessments that occur throughout the system development contract. As a result, the teams must continually assess compliance of the evolving system design solution relative to the speci cation requirements. We refer to the evolving system design solution as the Developmental Con guration and the test activities during system development as the Developmental Test and Evaluation (DT&E).