Speci cation Development Approaches in .NET

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31.3 Speci cation Development Approaches
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Even if the requirements are topically relevant, they may miss or over-/underspecify the capabilities and levels of performance required for the new system s eld application. Guidepost 31.2 Our discussion of the performance-based and model based approaches provide a better method of developing a speci cation. As we will see, the model-based approach presumes some knowledge of the SYSTEM/entity architecture and employs the model-based approach to specify entities with the architecture.
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The Performance-Based Approach
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The performance-based approach speci es SYSTEM/entity capability requirements in terms of performance boundary conditions and transactions. The SYSTEM/entity is automatically treated as a simple box with inputs and outputs, as illustrated in Figure 31.1. The speci cation s Section 3.0 Requirements identi es the SYSTEM/entity: 1. 2. 3. 4. 5. Relationship to User Level 0/Tier 0 systems or external interfaces System missions, phases, modes/use cases ACCEPTABLE and UNACCEPTABLE inputs Capabilities required to transform the inputs into performance-based outcomes ACCEPTABLE and UNACCEPTABLE outputs behavior, products, by-products, and services 6. Design and construction constraints Performance speci cations represent the preferred approach to speci cation development for many applications, particularly unprecedented systems. By AVOIDING design speci c requirements, the Acquirer provides the System Developer with the exibility to innovate and create any number of architectural solutions within contract cost, schedule, and risk constraints. Depending on the Acquirer s intent, performance-based speci cations require extensive System Developer/ Subcontractor s structured analysis and derivation of requirements to select a preferred system architecture. Most Acquirers developing an unprecedented system unproved tend to favor the performance-based speci cation approach as the initial step of a multi-phase acquisition strategy where
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Design & Construction Constraints
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Products ACCEPTABLE Range(s) of Inputs
UNACCEPTABLE Range(s) of Inputs
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Operational Capabilities Operational Capabilities - -Use Case #1 Use Case #1 - -Use Case #2 Use Case #2 - - ... ... - -Use Case #n Use Case #n
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System/Entity System/Entity
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Acceptable Unacceptable
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Acceptable Unacceptable
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Figure 31.1 Performance-Based Approach to Speci cation Development
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31
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Speci cation Development
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requirements may be unknown or immature. The strategy may employ a series of spiral development contracts to evolve and mature the system requirements. Consider the following example:
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EXAMPLE 31.1
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An Acquirer plans to develop an unprecedented system. After due consideration, the Acquirer decides to establish a multi-phase acquisition strategy. Phase 1 of the acquisition strategy results in the award of a performance-based speci cation contract to develop initial prototypes for testing, collecting, and analyzing performance data; selecting a system architecture; and producing a set of requirements as the work product for a Phase 2 follow-on prototype or system. There may even be several other spiral development phases, all focused on derisking the nal system development.
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As the Phase 1 requirements and system architecture mature over one or more contracts, the Acquirer may shift to our next topic, the model-based structured analysis approach.
The Model-Based Structured Analysis Approach
The model-based structured analysis approach focuses on specifying and bounding capabilities and performance for elements within a de ned SYSTEM/entity model-based architectural framework, as illustrated in Figure 31.2. This approach is often referred to as model-based structured analysis. The SYSTEM level is still treated as a box. However, the SYSTEM is analytically decomposed into an architecture of interrelated entities or capabilities. Each SYSTEM architectural entity SUBSYSTEM or capability can be treated two ways: 1. As a performance-based entity using the performance-based approach. 2. Or, decomposed to lower level architectures of entities or capabilities. To illustrate this approach, consider the following example:
MISSION MISSION RESOURCES RESOURCES
Design & Design & Construction Construction Constraints Constraints
SYSTEM
External External System #1 System #1 External External System #2 System #2 Input #1 Subsystem A A1 Input #2 A3 A4 Subsystem D A4 - C2 Subsystem C Input #3 External External System #3 System #3 C1 C2 C2 - D1 D1 D4 Input #4 C3 D5 D2 D3 Out #4 Out #5 External External System #7 System #7 A2 A2 - B1 Subsystem B Out #1 B1 B1 - D1 B2 External External System #4 System #4 External External System #5 System #5
Out #2
Out #3
External External System #6 System #6