![]() ![]() IEEE defines validation as ‘a process for determining whether the requirements and the final, as-built system or software product fulfils its specific intended use.’ Thus, validation substantiates the software functions with sufficient accuracy with respect to its requirements specification. ![]() In addition, it is the process of establishing a procedure and method, which provides the intended outputs. Validation is the process of evaluating the product at the end of each phase to check whether the requirements are fulfilled. IEEE defines verification as ‘a process for determining whether the software products of an activity fulfill the requirements or conditions imposed on them in the previous activities.’ Thus, verification confirms that the product is transformed from one form to another as intended and with sufficient accuracy. Verification is the process of evaluating a system or its components for determining the product developed at the end of each phase of the software development. This requires Verification and Validation (V&V) of the products after each and every phase of the software development life cycle. However, a process should detect defects in the phases in which they occur. Other advantages of the software process model are listed below.Įvery software development process model takes requirements as input and delivers products as output. In addition, it provides a flexible framework for enhancing the processes. IEEE defines a process model as ‘a framework containing the processes, activities, and tasks involved in the development, operation, and maintenance of a software product, spanning the life of the system from the definition of its requirements to the termination of its use.’ A process model reflects the’ goals of software development such as developing a high quality product and meeting the schedule on time. Thus, it is essential to define process models for each software project. Inaddition, it helps the software development team in facilitating and understandingthe activities involved in the project.Ī process model for software engineering depends on the nature and application of the software project. It provides a basisfor controlling various activities required to develop and maintain the software. This is in contrast with iterative ways of working, with an emphasis on delivering less complex products, often to test customer response before making adjustments.A process model can be defined as a strategy (also known as software engineering paradigm), comprising process, methods, and tools layers as well as the generalphases for developing the software. Central to the approach is an assumption that by adhering to the requirements captured at the outset, the product will fulfil the wishes of those customers: Products developed using these models are intended to be complete when released to customers. Sequential models such as Waterfall or V-Model rely on intensive periods of collecting and refining requirements for a product before design and development activity can take place. ![]() They are taken from ‘ Changing Times: Quality for Humans in a Digital Age‘. The images below are intended to provide a simple representation of the difference between sequential and iterative development approaches. ![]()
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