Ch2 - Chapter 2 Software Processes Lecture 1 Chapter 2...

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Chapter 2 – Software Processes Lecture 1 1 Chapter 2 Software Processes
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Topics covered Software process models Process activities Coping with change The Rational Unified Process An example of a modern software process. 2 Chapter 2 Software Processes
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The software process A s t r u c t u r e d s e 3 Chapter 2 Software Processes
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Software process descriptions When we describe and discuss processes, we usually talk about the activities in these processes such as specifying a data model, designing a user interface, etc. and the ordering of these activities. Process descriptions may also include: Products, which are the outcomes of a process activity; Roles, which reflect the responsibilities of the people involved in the process; Pre- and post-conditions, which are statements 4 Chapter 2 Software Processes
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Plan-driven and agile processes Plan-driven processes are processes where all of the process activities are planned in advance and progress is measured against this plan. In agile processes, planning is incremental and it is easier to change the process to reflect changing customer requirements. In practice, most practical processes include elements of both plan-driven and agile approaches. There are no right or wrong software 5 Chapter 2 Software Processes
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Software process models T h e w a t e r f a l l m 6 Chapter 2 Software Processes
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The waterfall model 7 Chapter 2 Software Processes
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Waterfall model phases T h e r e a r e s e p a r 8 Chapter 2 Software Processes
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Waterfall model problems I n f l e x i b l e p a r t 9 Chapter 2 Software Processes
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Incremental development 10 Chapter 2 Software Processes
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Incremental development benefits T h e c o s t o f a c c 11 Chapter 2 Software Processes
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Incremental development problems The process is not visible. Managers need regular deliverables to measure progress. If systems are developed quickly, it is not cost-effective to produce documents that reflect every version of the system. System structure tends to degrade as new increments are added . Unless time and money is spent on refactoring to improve the software, regular change tends to corrupt its structure. Incorporating further software changes becomes increasingly difficult and costly. 12 Chapter 2 Software Processes
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Reuse-oriented software engineering B a s e d o n s y s t e m 13 Chapter 2 Software Processes
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Reuse-oriented software engineering 14 Chapter 2 Software Processes
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Types of software component Web services that are developed according to service standards and which are available for remote invocation. Collections of objects that are developed as a package to be integrated with a component framework such as .NET or J2EE.
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