What Is the V Model in Software Testing? Unveiling the V Model

The software development life cycle (SDLC) is the software creation process. It is divided into parts, delineating a clear structure for achieving the ultimate goal — the realization of a finished digital product. The type of SDLC model developers, designers, and testers choose to follow sets the tone for this procedure.

Like a waterfall model, the V model represents a concept where the testing stage follows every development stage. The sequential nature of the V model in software creation offers high discipline and planning over the process.

This article will shed more light on the V model in software testing, its phases, benefits, and cases when its implementation is most suitable.

What Is V Model in Software Testing?

The V model is a software development and testing methodology where a testing procedure accompanies every stage. It is also known as the verification and validation model, as there is no going to another stage without properly completing the previous one.

Its name refers to the visual representation where the processes are constructed in a V-shape and where the process occurring on the left has a compatible process on the right. It is all supported by coding, which applies at every stage.

Even though this approach might sound confusing, its application, recommended from the beginning of the SDLC, is easy to employ and manage. It is characterized by a strict structure and the implementation of clearly defined tasks without possible flexible changes. Based on these facts, a V-shaped model can be appropriate for medical or banking development fields where strong security measures are required.

V Model Testing Phases

The V model encompasses two processes: development stages or verification phases and testing stages or validation phases. Accordingly, they are located on the left, opposite the others on the right. Let’s take a closer look at the processes that occur at every stage.

Verification Phases: Left-Side Location

The following stages represent development procedures on the left side.

Business Requirements Analysis

Before the development stage, executive teams and customers gather to set the requirements and share the expectations. This phase is crucial since going back can not be done in the V model of testing. Thus, poor communication and lack of agreement from all the participants can lead to misunderstandings in the further development stages.

System Design

The engineers study everything previously discussed. System design clarifies questions for the development team, as they already have user requirements documentation and can prepare for a development setup.

Architectural Design

This high-level design (HLD) stage is characterized by building a product “skeleton”. Developers define software elements, which are modules, their interfaces, and their relations with each other. The decisions are made based on software technical characteristics like hosting specifics and financial factors.

Module Design

If, at the previous stage, specialists were circling out the whole structure, at the low-level design (LLD) part, they look closer at every component, identifying its features, dependencies, databases, interfaces, error messages, and other specifics.

Implementation

Finally, we have come to the coding stage. Based on set system, architectural, and module requirements, developers choose the programming language best suited for product creation. Coding starts with modules and goes up, forming separate components into a system when the magic happens—a finished piece of software can be seen.

Validation Phases: Right-Side Location

Software testing life cycle (STLC) is implemented during validation and is executed by these phases.

Unit Testing

Unit test plans (UTPs) are conducted at the module design step. This type of testing is performed based on small components and units, ensuring everything operates as expected at a minimal level. Fixing errors in unit testing prevents major issues that, if not fixed, can damage the entire system.

Integration Testing

The architectural design stage is followed by integration testing. As soon as the separate components are confirmed to be working correctly, the quality assurance (QA) team verifies they can coexist.

System Testing

System test plans are inherent in the system design stage. They are developed to examine the software and its ability to perform correctly. Testers use system testing to check the product’s functional and non-functional aspects.

User Acceptance Testing

Acceptance testing refers to the business requirements analysis stage. At this phase, the application is tested in the user environment. The tests verify how the product functions in the real world and whether there are compatibility issues. Non-functional characteristics like load time are also checked during user acceptance testing.

Benefits of Using the V Model in Software Testing

This sequential and highly disciplined testing model comes with a lot of benefits:

• Early defect detection. Implementing the V model in software testing means testing from the very beginning of the development process. Since every step is confirmed by the relevant testing method, there is less chance of fixing bugs in the next steps, which is costly and time-consuming.
• Improved test planning and design. The strategy of the V model is transparent: there are defined phases and a scope of work that has to be done during every one of them. This ensures clear planning and improved efficiency.
• Improved communication and cooperation. The V model encourages close interaction between developers, designers, testers, and stakeholders. This, in turn, results in better process arrangements and keeps all the departments up to date.
• Reduced failure risk. Testing software at every development stage eliminates the possibility of facing errors during deployment. This tendency will continue if everything works correctly in the previous stages.
• Increased project predictability. The nature of the V model testing aims to set clear goals and document everything along the way. This helps predict and estimate essential factors such as budget size and time for release.

Disadvantages of V Model

This methodology can also be challenging for testers because of the following cons:

• Less flexibility. In the sequential V model conception, there is no place for flexibility. Every step is planned and defined, which makes it nearly impossible to correct or improve something on the go.
• Over-reliance on documentation. Every phase of the V model requires precise documentation. There is no chance to proceed if the documentation process is incomplete.

• Limitations for changes. Implementing changes to the later stages is highly challenging and can damage the whole project.

Conclusion

The V model in software testing is a methodology that sequentially arranges development and testing processes, building a logical correspondence between them. It involves verification and validation stages that, when combined, form a comprehensive approach.

This conception is best suited for projects where the requirements are clearly defined. For example, in the medical field, where software creators take responsibility for compatibility with regulations, the V model will offer the most appropriate solutions.

The concern about this methodology that might bother testers and developers is flexibility. However, this aspect can be improved by integrating flexible testing and development techniques.

When it comes to choosing an experienced software testing team, White Test Lab can help. Our specialists are experts in different approaches to testing and the V model. If you want to be sure about the testing side, cooperation with us is the solution. Reach out to us to present your project!