Optimal System Requirements Concept in .NET

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Optimal System Requirements Concept
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Anecdotal data suggest that a notional pro le can be constructed to express the ideal quantity of speci cation requirements. To illustrate this notional concept, consider the graphic shown in Figure 33.2.
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Optimal UNDER Specification
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Point of Inflection
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OVER Specification
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Specification Adequacy & Utility
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Theoretical Threshold of Minimum Requirements for Optimal System Definition
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Breakpoint Threshold (Organization and Business Posture Dependent)
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Zone 1
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Zone of Increasing System Definition Adequacy
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Zone 2
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Zone of Increasing Requirements Restrictions
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Zone Where Requirements Restrictions Unduly Constrain Design Options & Diminish Feasibility
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Zone 3
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Diminishing SE Value Diminishing SE Design Options & Feasibility Diminishing SE Value Diminishing SE Design Options & Feasibility Point of Inflection Varies by System & System Entity Quantity of Requirements
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Figure 33.2 Speci cation Requirements Coverage Concept
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33.10 Guiding Principles
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The gure consists of a graphical pro le with three curved line segments. For discussion purposes, we will identify the area under each segment as a zone. Beginning at the intersection of the X- and Y-axes, every legitimate requirement that is identi ed at the top hierarchical levels increases the adequacy of system de nition toward a theoretical optimal level. We characterize this theoretical point as the point of in ection in the curve s slope. At the point of in ection, we should have an optimal number of requirements. Hypothetically, the quantity of requirements should be technically necessary and suf cient to specify a SYSTEM with the desired capabilities and levels of performance. At this level the requirements are minimally suf cient to specify and bound the User s intended operational needs. Beyond the point of in ection lies the Zone of Increasing Requirements Restrictions. As the slope of the curve indicates, requirements can be added but at the expense of speci cation adequacy and utility over speci cation. Each additional requirement restricts the SE design options and may increase technical, cost, schedule, technology, and support risk. As the quantity of requirements continues to increase to the right, you nally reach a breakpoint for Zone 3. Zone 3 represents the region where the requirements become too restrictive. Thus, the requirements unduly restrict SE design options and severely limit feasibility of the system. Generally, when this occurs, the Acquirer discovers this problem during the draft proposal stage. To alleviate the risk, the Acquirer may remove some requirements due to prohibitive technical, cost, schedule, technology, and support costs and risks. The problem described here is not unique to the Acquirer. The same problem challenges the System Developer program organization, not just at the SYSTEM level but at multiple levels of speci cations at lower levels. Every requirement at every level has a cost to implement and a cost to verify besides their schedule and risk implications. This impacts SE Design Process, the Component Procurement and Development Process and the System Integration, Test, and Evaluation (SITE) Process of the System Development Phase of the system/product life cycle. Does this concept answer the question: What is the optimal number of speci cation requirements No. However, it illustrates some hypothetical conditions the points of in ection and breakpoints that should be within your mindset. The bottom line is: writing speci cations requires more thought than simply writing random thoughts within schedule constraints. You need to THINK about WHAT you require and the potential rami cations on the System Developer. Author s Note 33.5 As a discipline, industry is consumed with metrics and comparing them with everyone else. While there may be some rough order of magnitude (ROM) relevance, do not lose sight that the end game is for the Acquirer, System Developer, and Subcontractors to respectively come to a mutual understanding and agreement on WHAT is to be delivered and emerge with a POSITIVE experience. Every system is different and should be evaluated on its own merits. If you make systemto-system comparison, make sure the two systems are comparable in form, t, and function.
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Final Thoughts
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The intent of the preceding discussion has been to heighten your awareness of a key theme: when specifying requirements, strive for the optimal number of requirements that is suf cient in quantity to adequately to cover the subject but few in quantity to avoid increasing costs, risks, and development time and reducing the exibility of equally quali ed design options.
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