V-Model
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V-Model


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DEFINITION - The V-Model, also called the Vee-Model, is a product-development process originally developed in Germany for government defense projects. It has become a common standard in software development. The V-Model gets its name from the fact that the process is often mapped out as a flowchart that takes the form of the letter V.

The development process proceeds from the upper left point of the V toward the right, ending at the upper right point. In the left-hand, downward-sloping branch of the V, development personnel define business requirements, application design parameters and design processes. At the base point of the V, the code is written. In the right-hand, upward-sloping branch of the V, testing and debugging is done. The unit testing is carried out first, followed by bottom-up integration testing. The extreme upper right point of the V represents product release and ongoing support.

The V-Model has gained acceptance because of its simplicity and straightforwardness. However, some developers believe it is too rigid for the evolving nature of IT (information technology) business environments.

Learn more about Software unit testing
Better software through debugging and unit testing: Bugs plague software project big and small, and today's complicated software makes debugging more difficult than ever. Let these tips, tutorials, podcasts and articles help you.
Unit testing critical for improving software quality: With unit testing, programmers can catch bugs early before they cause problems. It's important to encourage such testing and not scare programmers with extreme testing practices.
Beautiful Code -- Chapter 7, Beautiful Tests: This excerpt written by Alberto Savoia shows how a broad, creative approach to testing can not only eliminate bugs but help programmers do their jobs better.
The Way of Testivus … or How to Complete Projects Ahead of Schedule: or How to Complete Projects Ahead of Schedule
Here's a unique booklet that drives home the importance of software testing, particularly unit testing.
Better software through debugging and unit testing: Bugs plague software project big and small, and today's complicated software makes debugging more difficult than ever. Let these tips, tutorials, podcasts and articles help you.
Better software through debugging and unit testing -- Other useful resources: Here is a list of books, blogs and Web sites that can offer you more information on debugging, unit testing, XP and test-driven development.
Better software through debugging and unit testing -- Unit testing, Extreme Programming and TDD: Unit testing is a key element of Extreme Programming (XP) and test-driven development (TDD). These tips, tutorials and articles will help you further understanding unit testing.
Better software through debugging and unit testing -- Unit testing basics: Unit testing is critical part of the debugging process. These tips, tutorials and podcasts explain what unit testing is and how to effectively conduct them.
The Way of Testivus … or How to Complete Projects Ahead of Schedule: or How to Complete Projects Ahead of Schedule
Here's a unique booklet that drives home the importance of software testing, particularly unit testing.

LAST UPDATED: 10 Jul 2007

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More resources from around the web:
- Ram Manohar Tiwari provides a concise overview of the V-Model.
- The Systems Engineering Department at George Mason University illustrates the V-Model concept.
- The Graphical Development Process Assistant (GDPA) at the University of Bremen discusses the technical aspects of the V-Model.





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