Software testing and the V model. What is the V model? The V model is used to describe and present users with a better understanding of what goes on during the software creation and testing lifecycle. Like the waterfall model, the V model tracks the execution of its elements sequentially. This method is represented in a V-shaped diagram as the name suggests, where all phases of development are parallel to its testing counterpart, defines a logical relationship between phases, the process is balanced and relies on completion and checking each step before moving on to the next. The layout of the Model V makes it quite easy to follow and understand. This works well in projects where the requirements are well understood and require minimal changes. Testing activities such as test planning and design take place early in the project life cycle. This allows testers to plan and manage their resources more efficiently. It prevents defects from going through the development stages and allows them to be identified earlier. Some of the main disadvantages are that this results in a less flexible structure, which does not allow many changes to be implemented once the initial requirements and specifications have been defined. If changes in the software design need to be implemented, then all resulting documents. for earlier steps need to be updated. In general, the Model V works exceptionally well for small projects with well-defined specifications and plenty of resources available. Component Testing Component or unit testing is at a lower level in the Model V testing hierarchy. It is usually performed by developers because creating the test requires programming knowledge. Middle of paper......it is absolutely necessary to choose just one. I would keep the system testing phase, the reasons for my choice are as follows:1. Most system tests and test cases are designed from the initial design and specifications to verify and verify that contract requirements have been met. Which means that the overall objective has been achieved.2. If the system can pass testing at this level, even though it may still have a lot of bugs, at least now we know it works and does what is required.3. There are some flaws that aren't noticeable until you reach this level, hence the reason not to choose any of the ones above it. I think that with the right test cases it might still be possible to reduce most of the effects caused, without going through the previous two levels of testing, because most of these defects are still detectable at this level..