Chap01_Systemupdated

Chap01_Systemupdated - Chapter 1 System 1-2 What Is a...

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Unformatted text preview: Chapter 1 System 1-2 What Is a System? A system is an interrelated set of components which are viewed as a whole. It has: Components – its basic parts Structure – how the components are organized Function – what the system does Objectives – the human purposes served by the system 1-3 What Is a System? A system can be broadly defined as an integrated set of elements that accomplish a defined objective. People from different engineering disciplines have different perspectives of what a "system" is. For example, software engineers often refer to an integrated set of computer programs as a "system." Electrical engineers might refer to complex integrated circuits or an integrated set of electrical units as a "system." 1-4 What Is a System? a system is a collection of parts that interact with each other to function as a whole. In the software engineering arena, a system is often equated with software, or perhaps with the combination of computer hardware and software. Here, we use the term system in its broader sense. As shown in Figure 1-1, a system is the entire set of components, both computer related, and non-computer related, that provides a service to a user. For instance, an automobile is a system composed of many hundreds of components, some of which are likely to be computer subsystems running software. 1-5 Figure 1-1 1-6 Figure 1-1 A system exists in an environment and has operators and users (possibly the same). The system provides feedback to the operator and services to the user. Operators are shown inside the system because operator procedures are usually a part of the system design, and many system functions, including fault recovery, may involve operator action. Not shown in the figure, but of equal importance, are the system's designers and maintainers. Systems are developed to satisfy a set of requirements that meet a need. A requirement that is important in some systems is that they be highly dependable. Fault tolerance is a means of achieving dependability 1-7 Can One System be a "Piece" of Another System? YES! We have seen that systems are composed of interrelated parts. When one of these parts is itself a system ( i.e., that part consists of two or more interrelated parts), we call the smaller system a subsystem and the larger system its super system. And that larger system, of course, can be a subsystem of a still larger system. 1-8 Software System A software system is a system based on software forming part of a...
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This note was uploaded on 01/04/2010 for the course MSC CP 1312 taught by Professor Ms.nireshfathima during the Fall '09 term at Unity.

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Chap01_Systemupdated - Chapter 1 System 1-2 What Is a...

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