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SWE 513

SWE 513. COMPUTER-BASED SYSTEM ENGINEERING. SYSTEM. A system is a purpuseful collection of interrelated componenets that work together to achieve some objective. The overall weight of the system The reliability of the system The usability of the system. EMERGENT SYSTEM PROPERTIES.

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SWE 513

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  1. SWE 513 COMPUTER-BASED SYSTEM ENGINEERING

  2. SYSTEM • A system is a purpuseful collection of interrelated componenets that work together to achieve some objective. • The overall weight of the system • The reliability of the system • The usability of the system

  3. EMERGENT SYSTEM PROPERTIES • Functional properties • Non-functional emergent properties • Hardware reliability • Software reliability • Operator reliability

  4. SYSTEMS AND THEIR ENVIRONMENT • Process changes • Job changes • Organisational changes

  5. THE SYSTEM ENGINEERING PROCESS • Interdisciplinary involvement • Reduced scope for rework during system development • System requirements definition • Abstract functional requirements • System properties • Characteristics which the system must not exhibit

  6. THE SYSTEM ENGINEERING PROCESS • System design • Partition requirements • Identify subsystems • Assign requirements to sub-systems • Specify sub-system functionality • Define sub-system interfaces • Sub-system development • System integration • System installation • System operation • System evolution

  7. SYSTEM PROCUREMENT • To buy or let a contractor to design and build a system • Cheaper to buy than to design • Large systems have a mixture of off-the-shelf components and designed components

  8. SUMMARY • System engineering is a complex and difficult process which requires input from a range of engineering disciplines. • The emergent properties of a system are properties that are characteristic of the system as a whole rather than of its component parts: • Performance, reliability, usability, safety and security. • System architectures are usually described using block diagrams showing the major subsystems and their relationships • The system engineering process includes specification, design, development, integration and testing. • The system procurement process involves specifying the system, issuing a request for propsals, choosing a supplier and then letting a contract for the system.

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