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Chap01_Systemupdated

Chap01_Systemupdated - Chapter1 System WhatIsaSystem Ithas...

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Chapter 1 System
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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
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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." 
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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.  
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1-5 Figure 1-1
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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
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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.
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1-8 Software System software system  is a system based on software  forming part of a  computer system
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  • Fall '09
  • Ms.NireshFathima
  • analyst, Analyst User management Systems management, Analyst System designer User management User operations workers Systems management, Analyst User management User operations workers Systems management

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