THE "V" MODEL CONCEPT OF TESTING

Testing Life cycle involves continuous testing of the system during the developmental process. At predetermined points, the results of the development process re inspected to determine the correctness of the implementation. These inspections identify defeats at the earliest possible point.

Testing life cycle cannot occur until a formalized SDLS has been incorporated. Testing Life Cycle is dependent upon the completion of predetermined deliverable at specified points in the development life cycle. If information services personnel have the discretion to determine the order in which deliverables are developed, the cycle test process becomes ineffective. This is due to variability in the process, which normally increases cost.

Testing life cycle concept can best be accomplished by the formation of a test team. The team is comprised of members of the project who may be both implementing and testing the system. When members of the team are testing the system, they must use a formal testing methodology to clearly distinguish the implementation mode from the test mode. They also must follow a development. Without a specific structure test methodology for testing as they used for developing the system under one methodology and testing it under another.

Advantages and Disadvantages of the Waterfall Model and V-Model

The Verification and Validation model commonly known as V Model is considered to be an extension of the Waterfall model. This is because just like the waterfall model, it’s a welltructured method in which the different phases progress in a sequential or linear way. That means each phase begins only after the completion of the previous phase.


An important aspect of this model is that testing activities like planning, test designing happens well before coding. The advantage is that it saves ample amount of time and since the testing team is involved early on, they develop a very good understanding of the project at the very beginning.


The biggest disadvantage of V-model is that it’s very rigid and the least flexible. If any changes happen mid way, not only the requirements documents but also the test documentation needs to be updated. Even with these disadvantages, it’s the most favored software development process as it’s simple and easy to use.

In short we can summaries these as below:

WaterFall Model advantages:
                It is a linear sequential model
                It is very simple model to implement
                It is the first model.
                It needs very few resources to implement
Disadvantages:
                In this model there is no back tracking.
                For example if any error occurred at any stage of software development, it can’t be corrected in that build.

V-Model advantages:
                It is also called as verification and validation Model.
                This means the verification and validation will be done side by side.
                It emphasis is the strict process flow to develop a quality product.
                The errors occurred in any phase will be corrected in that phase itself.
V-Model disadvantages:
                It needs lot of resources and money.
                It needs an established process to implement.
                It can be implemented by only some big companies.

V-Model Concept of Testing