Component Selection and Development in .NET

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Component Selection and Development
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41.1 INTRODUCTION
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The allocation of System Performance Speci cation (SPS) and item development speci cation requirements to multi-level items is a highly iterative process driven by component selection decisions. In general, System Developers have to answer the question: WHAT is the best value, lowest cost, acceptable risk approach to selecting components to meet contract requirements 1. Are there in-house, reusable components already available 2. Do we procure commercially available components from external vendors 3. Are there commercially available components that require only minor modi cations to meet our requirements 4. Do we procure commercially available components from external vendors and modify them in-house or have the vendor modify them 5. Do we obtain components from the User as Acquirer furnished property (AFP) 6. Do we create the component in-house as new development Depending on the outcome of these questions and the item s required capabilities, the initial requirements may have to be reallocated to supplement capabilities of commercial components. Our discussion in this section focuses on component selection and development practices that drive SE decision making. After a brief discussion of options available for system development, we introduce the concepts of commercial off-the-shelf (COTS) and nondevelopmental items (NDIs). Next, we de ne a methodology that describes a decision-making method for selecting the strategy for component development. We conclude with a summary of driving issues that in uence COTS/NDI selection. Author s Note 41.1 Typically the next chapter on system con guration identi cation should precede component selection and development. However, con guration identi cation employs terms such as COTS and NDI, which are de ned in this chapter. Therefore, we consider this chapter s material rst.
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System Analysis, Design, and Development, by Charles S. Wasson Copyright 2006 by John Wiley & Sons, Inc.
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41.2 Reducing System Costs and Risk
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What You Should Learn from This
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1. 2. 3. 4. 5. 6. 7. 8. 9. What are the six primary approaches for developing components What is a commercial off-the-shelf (COTS) item What is a nondevelopmental item (NDI) What is Acquirer furnished property (AFP) What is the source of AFP How are COTS items procured How are NDIs procured What are the steps of the component selection methodology What are the classes of criteria to be considered when selecting components from external vendors
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De nitions of Key Terms
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Acquirer Furnished Property (AFP) Physical assets such as equipment, data, software, and facilities provided by the User or other organizations via the Acquirer by contract to the System Developer for modi cation and/or integration into a deliverable system, product, or service. Commercial Off-the-Shelf (COTS) Product A standard product line item that is offered for general sale to the public by a vendor and requires no unique modi cations or maintenance over the life cycle of the product to meet the needs of the procuring agency (Acquirer). (Source: Adapted from DoD/FAR and DSMC, Glossary of Terms) Legacy System An existing system that may or may not be operational. Make Buy Modify Decisions Technical decisions that determine whether to develop an item or lower level item internally, procure as a COTS/NDI or subcontract item from an external vendor, or procure an item from an external vendor and modify internally to meet item development speci cation requirements. Nondevelopmental Item (NDI) A COTS item that has been modi ed or adapted (i.e., customized or tailored) to meet procurement speci cation requirements for application in a speci c OPERATING ENVIRONMENT. Out-of-the-Box Functionality Speci ed capabilities and levels of performance inherent to a COTS product or NDI without additional development. Outsourcing A business decision to procure systems, products, or services from external organizations based on cost avoidance resource availability, or other factors.
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41.2 REDUCING SYSTEM COSTS AND RISK
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One of the key objectives of SE is to minimize development and life cycle costs as well as risk. Achievement of these objectives requires insightful strategies that include selection of components. Most engineers enter the workforce with noble aspirations to innovate and create elegant designs. Although this is partially true, it is also a re ection of misunderstood priorities. New design should be a LAST resort after attempts to nd existing components that meet speci cation requirements have been exhausted. So, what should the priorities be This brings us to item design implementation options and priorities.
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