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Questions and Answers
What is an iteration in the iterative-and-incremental model?
What is the purpose of the test workflow in each iteration?
What is a benefit of the iterative-and-incremental model?
What is the purpose of iteration in the iterative-and-incremental model?
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What is a characteristic of the iterative-and-incremental model?
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What is the benefit of having multiple opportunities for checking the software product?
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What is the purpose of the classical design phase in each iteration?
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What is the benefit of having a working version of the software product from the start?
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What is the purpose of incrementation in the iterative-and-incremental model?
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What is a benefit of the iterative-and-incremental model according to the CHAOS reports?
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What is the ideal software development process described in Chapter 1?
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What is the main difference between the ideal software development process and the real-world software development process?
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What is the main benefit of the iterative and incremental software development process?
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What is the moving target problem in software development?
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What is Miller's Law in software development?
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What is the difference between the waterfall model and the evolution-tree model?
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What is the main benefit of the evolution-tree model?
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What is the main difference between classical phases and workflows?
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What is the main benefit of using workflows instead of classical phases?
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What is the main difference between incrementation and iteration?
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Study Notes
Software Development Life Cycle Models
- Software development in theory is ideally linear, starting from scratch, and follows a specific sequence.
- In reality, software development is iterative and incremental, with changes and mistakes occurring throughout the process.
Winburg Mini Case Study
- The Winburg mini case study demonstrates the iterative and incremental nature of software development.
- The case study involves four episodes: implementation, finding and fixing a fault, adopting a new design, and changing requirements.
- Each episode builds upon the previous one, with changes and corrections made along the way.
Evolution-Tree Model
- The evolution-tree model shows the explicit order of events in software development.
- The model highlights the iterative and incremental nature of software development, with multiple instances of each phase.
- At the end of each episode, a complete set of artifacts (constituent components) is produced.
Lessons of the Winburg Mini Case Study
- In reality, software development is more chaotic than the Winburg mini case study.
- Changes are always needed due to the dynamic nature of the real world and human mistakes.
- Software development is a model of the real world, which is continually changing.
Teal Tractors Mini Case Study
- The Teal Tractors mini case study demonstrates the impact of changing requirements on software development.
- Changes to the software product can be disastrous, even if the reasons for the change are good.
- The moving target problem occurs when changes are made to the software product while it is being developed.
Iteration and Incrementation
- Iteration and incrementation are used in conjunction with one another to develop software.
- The basic software development process is iterative, with each successive version intended to be closer to its target than its predecessor.
- Miller's Law states that at any one time, we can concentrate on only approximately seven chunks (units of information).
Classical Phases versus Workflows
- Sequential phases do not exist in the real world; instead, the five core workflows (activities) are performed over the entire life cycle.
- The five core workflows are: requirements, analysis, design, implementation, and test.
- Planning and documentation activities are performed throughout the life cycle.
Risks and Other Aspects of Iteration and Incrementation
- Each iteration can be viewed as a small but complete waterfall life-cycle model.
- Strengths of the iterative-and-incremental model include:
- Multiple opportunities for checking that the software product is correct.
- Determining the robustness of the architecture early in the life cycle.
- Mitigating risks early.
- Having a working version of the software product from the start.
- Empirical evidence that the life-cycle model works.
Managing Iteration and Incrementation
- The iterative-and-incremental life-cycle model is as regimented as the waterfall model.
- Each increment is a waterfall mini project, with the model applied successively.
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Description
Test your understanding of software development life cycle models, including the iterative and incremental nature of the process, with a case study on Winburg.