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February27 - SoftwareReuse q q components Objectives...

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©Ian Sommerville 2000 Software Engineering, 6th edition. Chapter 14 Slide 1 Software Reuse Building software from reusable components Objectives To explain the benefits of software reuse and some reuse problems To describe different types of reusable component and processes for reuse To introduce application families as a route to reuse
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©Ian Sommerville 2000 Software Engineering, 6th edition. Chapter 14 Slide 2 Reuse-based software engineering Application system reuse The whole of an application system may be reused either by incorporating it without change into other systems (COTS reuse) or by developing application families Component reuse Components of an application from sub-systems to single objects may be reused Function reuse Software components that implement a single well-defined function may be reused
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©Ian Sommerville 2000 Software Engineering, 6th edition. Chapter 14 Slide 3 Benefits of reuse Increased reliability Components exercised in working systems Reduced process risk Less uncertainty in development costs Effective use of specialists Reuse components instead of people Standards compliance Embed standards in reusable components Accelerated development Avoid original development and hence speed-up production
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©Ian Sommerville 2000 Software Engineering, 6th edition. Chapter 14 Slide 4 Requirements for design with reuse It must be possible to find appropriate reusable components The reuser of the component must be confident
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