V-Model in Software Testing

A testing phase runs concurrently with each phase of development in the V Model’s highly disciplined software development life cycle (SDLC) model. The V model is an extension of the waterfall model in which testing is carried out on each stage simultaneously with development in a sequential manner. The Validation or Verification Model is the name commonly given to this structure.

Key Terms Used in Software Engineering:

The abbreviation for Software Development Life Cycle (SDLC) is “SDLC.” It refers to the order in which activities are carried out by Developers in order to design and create software of a high quality.

The acronym STLC stands for the “Software Testing Life Cycle.” It is made up of a sequence of activities that are carried out by Testers in a methodical manner in order to test your software product.

The Waterfall Model is a Sequential Model That Is Divided Into Various Phases Of Software Development Work The Waterfall Model is also known as the Traditional Model. Each step was devised with the intention of carrying out the relevant action. The testing part of the waterfall model does not begin until after the system has been completely implemented.

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EXAMPLE To Get a Better Understanding of the V Model
Imagine that you have been tasked with the responsibility of creating bespoke software for a customer. Now, regardless of the level of technical training you have, you should strive to make an educated guess about the order in which you will complete the tasks necessary to complete the assignment.

What exactly is the V Model?

Studying a Case Study using the SDLC and STLC for Learning
The following would be the proper order:

The Catch-22 of Using the Waterfall Model
As you may have noticed, the testing of the model does not begin until after the implementation has been completed.

However, if you are working on a large project where the systems are complicated, it is simple to miss out on the essential particulars while working on the requirements phase itself. If this happens, the client will receive an entirely incorrect product, and you will likely have to restart the project from the beginning. Alternatively, if you are able to correctly note the requirements for the software you are developing, but you make serious mistakes in the design or architecture of the software, you will need to redesign the entire software in order to correct the error.

Thousands of projects’ worth of assessments have shown that requirements and design phases are where the majority of defects are introduced, accounting for close to half of the total number of defects.

Guide to SDLC , STLC & V-Model

In addition, the costs of correcting a defect rise with each successive stage of the development lifecycle. When a problem is found earlier in a product’s life cycle, it costs less to rectify the situation. “A stitch in time saves nine,” as the old proverb goes.

The V Model is the Solution

In order to address this concern, the V model of testing was developed. According to this model, there is a corresponding Testing phase for each phase in the Development life cycle.

v model

The Software Development Life Cycle, abbreviated as SDLC, can be found on the model’s left side.

The Software Test Life Cycle, abbreviated as STLC, can be found on the model’s right side.

The entire form resembles a V, which is where the name “V-model” comes from.

In addition to the V model, there are also iterative development models. In these models, development is carried out in phases, and at the end of each phase, the software receives a new functionality. Each phase includes its own distinct collection of activities pertaining to development and testing.

Rapid Application Development and Agile Development are two development lifecycles that are good examples of iterative method development lifecycles.


There are many different models for the development life cycle. The objectives and targets of a particular project should guide the choice of development model for that project.

Testing is not an independent activity, and it must conform to the model of development that was selected for the project in order to be effective.

Testing ought to be carried out on every level of every model, beginning with the requirements and going all the way up to the maintenance.