Software Development Life Cycle Models Quiz

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?

To change the relevant artifacts if necessary Signup and view all the answers

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

It is a regimented approach to software development Signup and view all the answers

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

Faults can be detected and corrected early Signup and view all the answers

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

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

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

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

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

To extend the artifacts and create a complete software product Signup and view all the answers

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

The percentage of successful projects increases Signup and view all the answers

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

Linear Signup and view all the answers

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

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

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

It allows for a more flexible and adaptable development process Signup and view all the answers

What is the moving target problem in software development?

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

What is Miller's Law in software development?

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

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

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

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

It shows the explicit order of events Signup and view all the answers

What is the main difference between classical phases and workflows?

Classical phases are sequential, while workflows are iterative and incremental Signup and view all the answers

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

It allows for a more flexible and adaptable development process Signup and view all the answers

What is the main difference between incrementation and iteration?

Incrementation is the process of breaking down the development process into smaller chunks, while iteration is the process of repeating these chunks 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.