Software Development Life Cycle(SDLC)SDLC:One of the basic notions of the software development process is SDLC models which stands for Software Development Life Cycle models. SDLC – is a continuous process, which starts from the moment, when it’s made a decision to launch the project, and it ends at the moment of its full remove from the exploitation. There is no one single SDLC model. They are divided into main groups, each with its features and weaknesses.Evolving from the first and oldest “waterfall” SDLC model, their variety significantly expanded. The SDLC models diversity is predetermined by the wide number of product types – starting with a web application development to a complex medical software. And if you take one of the SDLC models mentioned below as the basis – in any case, it should be adjusted to the features of the product, project, and company. The most used, popular and important SDLC models are given below:Waterfall modelIterative modelSpiral modelV-shaped modelAgile modelNo matter what type of the models has been chosen, each of them has basic stages which are used by every softwere development company. Let’s explore those stages as this is important for the understanding of the each of SDLC models and the differences between them.BASIC STAGES OF SOFTWARE DEVELOPMENT LIFE CYCLEStage 1. Planning and requirement analysis:Each software development life cycle model starts with the analysis, in which the stakeholders of the processdiscuss the requirements for the final product. The goal of this stage is the detailed
definition of the system requirements. Besides, it is needed to make sure that all the process participants have clearly understood the tasks and how every requirement is going to be implemented. Often, the discussion involves the QA specialists who can interfere the process with additions even during the development stage if it is necessary. Stage 2. Designing project architecture:At the second phase of the software development life cycle, the developers are actually designing the architecture. All the different technical questions that may appear on this stage are discussed by all the stakeholders, including the customer. Also, here are defined the technologies used in the project, team load, limitations, time frames, and budget. The most appropriate project decisions are made according to the defined requirements.Stage 3. Development and programming:After the requirements approved, the process goes to the next stage – actual development. Programmers start here with the source code writing while keeping in mind previously defined requirements. The system administrators adjust the software environment, front-end programmers develop the user interface of the program and the logics for its interaction with the server.