Requirements verification and validation is a vital aspect of applications and software engineering. The significance of verifying and validating (especially testing) is a significant reason why a minor modification has been made to the traditional waterfall development cycle, creating a model V that links early development with its corresponding future testing operations.
This ‘V’ Model is commonly known as the software development model for testing and verification, which is one of the most well-known methods in software development. Although considered an improvement of the waterfall model and also based on sequential steps moving down in a linear manner the process also has certain similarities, it differs from the waterfall model as steps move up to form the standard V form after the coding phase. This V structure shows the links between each developmental cycle phase and its associated testing phase.
Using this model eery step in the development cycle only starts if the preceding phase is complete and a correspondence-related check phase is conducted toward completion of this phase. Similar to the model Waterfall, the V-Model does not define the process for handling requirements changes back to the previous phase.
The technical dimension of the project process is regarded as a V type that starts with the company needs at the top left and finishes on the top right with the user acceptability check.
V-Model Model Phases
In addition, the evaluation process is divided into comprehensive phases for validation and verification. It therefore includes the following phases of testing:
● Unit Testing
The Unit Testing is a code test that helps to resolve problems at an early stage. The developer is mainly responsible for performing the unit testing for his code while not everything is detected during the unit testing.
● Functional Testing
Functional testing involves the low-level design phase, ensuring that collections of codes and units probably work jointly to perform a new function or service.
● Integration Testing
Integration testing is related to the high-level process of design. Integration testing ensures that all device components are compatible after implementing new features or improvements.
● System Testing
System testing is linked to the system and design phase requirements. It integrates this system's software, hardware and integration with other external systems.
● User Acceptance Testing
The test of user acceptance is associated with a phase of analysis of business and operations. Based on test cases and situations that cover business requirements, customers are the key performers of the tests to ensure that they produce the right software as needed.
When to use the V-Model Model?
Because of the design of the V-Model, once completed, it is hard to go back to the previous process. While this may be very rigid in some software projects requiring some flexibility, this model may be essential or the most appropriate model for the contexts of other software projects and focusing on quality as an important aspect of delivery.