What Is a System in .NET

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What Is a System
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3.1 INTRODUCTION
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Analysis, design, and development systems, products, or services requires answering several fundamental questions: 1. 2. 3. 4. 5. WHAT is a system What is included within a system s boundaries WHAT role does a system perform within the User s organization What mission applications does the system perform WHAT results-oriented outcomes does the system produce
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These fundamental questions are often dif cult to answer. If you are unable to clearly and concisely delineate WHAT the system is, you have a major challenge. Now add the element of complexity in bringing groups of people working on same problem to convergence and consensus on the answers. This is a common problem shared by Users, Acquirers, and System Developers, even within their own organizations. This chapter serves as a cornerstone for this text. It answers the rst question, What is a system We begin by de ning what a system is and explain the meaning of structural phrases within the de nition. Based on the de nition, we introduce various categories of systems and describe the differences between systems, products, and tools. We introduce the concept of precedented and unprecedented systems. Finally, we conclude by presenting an analytical and graphical representation of a system.
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What You Should Learn from This
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What is a system What are some examples of types of systems What are the differences between systems, products, and tools What is the difference between a precedented system and an unprecedented system How do we analytically represent a system
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System Analysis, Design, and Development, by Charles S. Wasson Copyright 2006 by John Wiley & Sons, Inc.
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What Is a System
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3.2 DEFINITION OF A SYSTEM
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The term system originates from the Greek term syst ma, which means to place together. Mule tiple business and engineering domains have de nitions of a system. This text de nes a system as: System An integrated set of interoperable elements, each with explicitly speci ed and bounded capabilities, working synergistically to perform value-added processing to enable a User to satisfy mission-oriented operational needs in a prescribed operating environment with a speci ed outcome and probability of success. To help you understand the rationale for this de nition, let s examine each part in detail.
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System De nition Rationale
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The de nition above captures a number of key discussion points about systems. Let s examine the basis for each phrase in the de nition. By an integrated set, we mean that a system, by de nition, is composed of hierarchical levels of physical elements, entities, or components. By interoperable elements, we mean that elements within the system s structure must be compatible with each other in form, t, and function, for example. System elements include equipment (e.g., hardware and software, personnel, facilities, operating constraints, support), maintenance, supplies, spares, training, resources, procedural data, external systems, and anything else that supports mission accomplishment. Author s Note 3.2 One is tempted to expand this phrase to state interoperable and complementary. In general, system elements should have complementary missions and objectives with nonoverlapping capabilities. However, redundant systems may require duplication of capabilities across several system elements. Additionally, some systems, such as networks, have multiple instances of the same components. By each element having explicitly speci ed and bounded capabilities, we mean that every element should work to accomplish some higher level goal or purposeful mission. System element contributions to the overall system performance must be explicitly speci ed. This requires that operational and functional performance capabilities for each system element be identi ed and explicitly bounded to a level of speci city that allows the element to be analyzed, designed, developed, tested, veri ed, and validated either on a stand-alone basis or as part of the integrated system. By working in synergistically, we mean that the purpose of integrating the set of elements is to leverage the capabilities of individual element capabilities to accomplish a higher level capability that cannot be achieved as stand-alone elements. By value-added processing, we mean that factors such operational cost, utility, suitability, availability, and ef ciency demand that each system operation and task add value to its inputs availability, and produce outputs that contribute to achievement of the overall system mission outcome and performance objectives. By enable a user to predictably satisfy mission-oriented operational needs, we mean that every system has a purpose (i.e., a reason for existence) and a value to the user(s). Its value may be a return on investment (ROI) relative to satisfying operational needs or to satisfy system missions and objectives.
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