Formulating and Selecting Candidate Physical Architectures in .NET

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In general, as discussed in 39 about the logical/functional architecture, the physical architecture is selected from a set of viable candidate architectures based on a pre-de ned set of decision criteria and weights. The previous statement sounds simple; however, it may be misleading in terms of HOW the physical architecture is selected. How so The reality is the physical architecture should represent the best value, acceptable risk, minimal life cycle support costs approach to ful lling the System Performance Speci cation (SPS) or entity s item development speci cation (IDS) requirements. Developing the Product Structure Tree. The rst step in developing the physical architecture is to identify generic physical items that comprise the SYSTEM or entity. Create a Product
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Developing an Entity s Physical Domain Solution
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1 CAR-DRIVER SYSTEM CAR-DRIVER SYSTEM
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Physical Architecture Physical Architecture
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Level 1 Physical SYSTEM
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OPERATING OPERATING CONSTRAINTS CONSTRAINTS Element Element PROCEDURAL PROCEDURAL DATA Element DATA Element MISSION MISSION RESOURCES RESOURCES Element Element
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EQUIPMENT EQUIPMENT Element Element FACILITIES FACILITIES Element Element
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OPERATING OPERATING ENVIRONMENT ENVIRONMENT Element Element
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PERSONNEL PERSONNEL Element Element
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Level 2 Physical SYSTEM
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SUBSYSTEM SUBSYSTEM
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Figure 40.1 System Element-Based Physical Architecture
Structure hierarchy tree such as the one shown in Figure 40.1 for a Car-Driver System. Although SEs often generically refer to this as a hierarchy tree, the proper designation is the SYSTEM S Product Structure. Ultimately, the Product Structure captures the hierarchical pieces and parts of the physical item. When you develop the Product Structure, a good rule of thumb is to avoid having more than six to eight components at any level of abstraction. If you have more than this number, you may have inadvertently mixed components from different levels of abstraction. Tailor appropriately to your own system application. Author s Note 40.2 Several things should be noted here. Figure 40.1 represents the rst pass at a physical architecture structure, an initial starting point. Once the make/buy/modify decisions are made, physical items from the initial hierarchical structure may be combined or separated as peer level items on subsequent passes and shown appropriately in the physical architecture diagram. Developing the Physical Architecture SBD. As the Product Structure evolves, create the physical architecture s system block diagram (SBD). Physical items at the SYSTEM level or entities within a given level of the Product Structure are linked via physical entity interfaces to their OPERATING ENVIRONMENT.
Linking the CWBS to the Physical Architecture
As the physical architecture evolves, develop the Contract Work Breakdown Structure (CWBS) Mission Equipment Element to re ect the physical architecture s levels of abstraction and physical con guration items (PCIs). Figure 40.1 illustrates a decomposition or expansion of the EQUIPMENT Element in terms of the physical architecture. Note that it links to and provides the PRIMARY hierarchical structure for the CWBS Mission Equipment Element.
40.3 Developing the Physical Architecture
Author s Note 40.3 Observe that we noted PRIMARY hierarchical structure. The reason is the CWBS also includes the (entity) Integration, Test, and Checkout Element at each Integration Point (IP) within in the Mission Equipment hierarchy.
COTS/NDI Physical Item Realities
COTS/NDI suppliers typically develop hardware and software for marketplace needs; not your unique program needs unless your organization is a strategically valued customer. Therefore, you will have to investigate and evaluate potential COTS/NDI candidate hardware and software products and determine which one best ts your needs, assuming they do. Since the COTS/NDI items may or may not provide the required level of functionality you require, you may have to supplement the lack of functionality with internal development. Organizations often refer to adapting COTS/NDIs to meet interface requirements as wrappers. So, HOW does this affect the architecture decisions It means that the initial physical architecture: 1. Product structure may have to be revised to re ect the new mix of internal development and COTS/NDI items for a speci c entity such as PRODUCT, SUBSYSTEM, or ASSEMBLY. 2. The entity s architecture (SBD, ABD, FBD, object, etc.) may have to be modi ed to re ect the item selections and their interfaces.