The V-model is a software development lifecycle model where each phase of development has a corresponding testing phase that validates it. The phases proceed from requirements analysis down to coding on the left side of the V, then back up with testing on the right side. The V-model is best suited for medium sized projects with ample resources where requirements are easily understood. It allows for thorough testing at each phase to avoid defects propagating downwards. However, it is a rigid model that is not well-suited for complex, object-oriented, or long-term projects.

1. V-model

2. What is V-model ?
V- model means Verification and Validation model.

3. When to use the V-model ?
 Medium sized projects
 Ample technical resources

4. V -Model

5. The various phases of the V-model are
as follows:
 Requirements like BRS and SRS begin the life cycle model
just like the waterfall model. But, in this model before
development is started, a system test plan is created.
 The high-level design (HLD) phase focuses on system
architecture and design.
 The low-level design (LLD) phase is where the actual
software components are designed

6.  The implementation phase is, again, where all coding takes
place.
 Coding: This is at the bottom of the V-Shape model. Module
design is converted into code by developers.

7. Advantages of V-model:
 This is highly disciplined model and phase are completed
one at a time.
 Works well for smaller project where requirements are easily
understood.
 Avoids the downward flow of the defects.
 Simple and easy to understand and use.

8. Disadvantages of V-model:
 Very rigid and least flexible.
 Software is developed during the implementation phase
 Not a good model for complex and object oriented project.
 Poor model for long and ongoing projects.

9. THANK YOU