Software Development Life Cycle Models Quiz
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Questions and Answers

What is an iteration in the iterative-and-incremental model?

  • A portion of the software product
  • A small but complete waterfall life-cycle model (correct)
  • An extension of the artifacts
  • A complete software product
  • What is the purpose of the test workflow in each iteration?

  • To select a portion of the software product
  • To change the relevant artifacts
  • To extend the artifacts
  • To check the artifacts (correct)
  • What is a benefit of the iterative-and-incremental model?

  • Increasing the number of iterations
  • Having a working version of the software product from the start (correct)
  • Reducing the number of opportunities for checking the software product
  • Delaying the detection of faults
  • What is the purpose of iteration in the iterative-and-incremental model?

    <p>To change the relevant artifacts if necessary</p> Signup and view all the answers

    What is a characteristic of the iterative-and-incremental model?

    <p>It is a regimented approach to software development</p> Signup and view all the answers

    What is the benefit of having multiple opportunities for checking the software product?

    <p>Faults can be detected and corrected early</p> Signup and view all the answers

    What is the purpose of the classical design phase in each iteration?

    <p>To create a detailed design of the selected portion of the software product</p> Signup and view all the answers

    What is the benefit of having a working version of the software product from the start?

    <p>The client and users can experiment with the working version to determine what changes are needed</p> Signup and view all the answers

    What is the purpose of incrementation in the iterative-and-incremental model?

    <p>To extend the artifacts and create a complete software product</p> Signup and view all the answers

    What is a benefit of the iterative-and-incremental model according to the CHAOS reports?

    <p>The percentage of successful projects increases</p> Signup and view all the answers

    What is the ideal software development process described in Chapter 1?

    <p>Linear</p> Signup and view all the answers

    What is the main difference between the ideal software development process and the real-world software development process?

    <p>The ideal process is linear, while the real-world process is iterative and incremental</p> Signup and view all the answers

    What is the main benefit of the iterative and incremental software development process?

    <p>It allows for a more flexible and adaptable development process</p> Signup and view all the answers

    What is the moving target problem in software development?

    <p>A change in the requirements while the software product is being developed</p> Signup and view all the answers

    What is Miller's Law in software development?

    <p>At any one time, we can concentrate on only approximately seven chunks of information</p> Signup and view all the answers

    What is the difference between the waterfall model and the evolution-tree model?

    <p>The waterfall model does not show the explicit order of events, while the evolution-tree model does</p> Signup and view all the answers

    What is the main benefit of the evolution-tree model?

    <p>It shows the explicit order of events</p> Signup and view all the answers

    What is the main difference between classical phases and workflows?

    <p>Classical phases are sequential, while workflows are iterative and incremental</p> Signup and view all the answers

    What is the main benefit of using workflows instead of classical phases?

    <p>It allows for a more flexible and adaptable development process</p> Signup and view all the answers

    What is the main difference between incrementation and iteration?

    <p>Incrementation is the process of breaking down the development process into smaller chunks, while iteration is the process of repeating these chunks</p> Signup and view all the answers

    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.

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