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Software Adaption (ST 2011) - Created with tele-TASK - more than video! Powered by Hasso Plattner Institute (HPI).Episode from the podcastSoftware Adaption (ST 2011) - Created with tele-TASK - more than video! Powered by Hasso Plattner Institute (HPI).
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Released Monday, 20th June 2011
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Summary and Comparison

Summary and Comparison

Summary and Comparison

Summary and Comparison

Monday, 20th June 2011
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While software is an immaterial object that does not decay with time, it is in fact “aging“ - as Parnas puts it – as we usually fail to adapt the software such that it meets our changing needs and make the software less valuable by doing the changes not careful enough. One of Lehman's laws of software evolution accordingly states that a system that is being used undergoes continuing adaption or degrades in effectiveness. Consequently, we can observe that the ability to cost-effectively adapt software has become one of the most important critical success factors for software development today.In this lecture we want review how software adaption is addressed at several levels and how far these approaches are able to cope with the need for cost-effective software adaption. We will at first review the need for adaption and study which different forms of adaption are relevant. We will then look into the classical software maintenance lifecycle phase and how required adaption due to changes in the environment is handled there. Then, we will look into approaches that contribute to better adaptable software where the costs for later adaption steps are reduced by taking the need for adaption into account upfront. Both directions are highly relevant, but cannot prevent that still major costs result due to the required adaption. Even worth, it seems that we can only limit the effects of the changes but cannot prevent aging in general. Therefore, also the idea to automate software adaption in form of self-adaptive software has been raised and we will look into such self-adaptive software. As it has the capability to adjust itself in response to changes in the environment, it promises to considerably reduce the costs for required adaption and to avoid a decline in quality. We will discuss existing proposals and solutions as well as its current limitations.

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