Software development LIFE CYCLE (SDLC)
April 25, 2023 | BLOGS
WHAT is Sdlc AND IT'S PHASES?
SDLC is a collection of processes which are followed by step by step to develop a good software. When we follow SDLC we have a detailed plan that how to build the software, How to deploy it in the market. The goal of SDLC is to minimize the risks through forward planning so that software meets customer expectations during production and beyond.
SDLC stands for Software Development Life Cycle. It is a structured approach or process used in the field of software engineering to guide the development of software systems or applications. It provides a structured and organized approach to software development, ensuring that software is developed in a controlled and planned manner, meeting the needs of stakeholders, and delivering a high-quality, reliable, and maintainable product.
Software Development Life Cycle, is a process that software developers follow to create software applications. Think of it as a series of steps or stages that are followed to develop software from start to finish. Here’s a simple explanation of SDLC in layman’s terms:
- Planning and requirement analysis.
- Defining requirements.
- Designing the product architecture.
- Building or developing the project.
- Testing the product.
- Deployment and maintenance.
Planning: In this stage, the software development team plans out what the software will do, who will use it, and how it will work. They gather requirements from users or clients and create a plan for the development process.
- In the Planning Phase, the Project Manager works with the project team to create the technical design, task list, resource plan, communications plan, budget, and initial schedule for the project, and establishes the roles and responsibilities of the project team and its stakeholders.
- The purpose of the Planning Phase is to plan all project processes and activities required to ensure project success and to create a comprehensive set of plans.
- Requirements analysis, also called requirements engineering, is the process of determining user expectations for a new or modified product.
- Requirements analysis is critical to the success or failure of a systems or software project. In the requirement analysis phase; we make sure, that the requirements should be documented, actionable, measurable, testable, traceable, related to identified business needs or opportunities, and defined to a level of detail sufficient for system design.
Design: Once the plan is in place, the team designs how the software will look and function. They create blueprints or designs of the software’s user interface and features, like a blueprint for a building.
In this third phase, the system and software design documents are prepared as per the requirement specification document. This helps define overall system architecture.
This design phase serves as input for the next phase of the model.There are two kinds of design documents developed in this phase:
Development: In this stage, the developers write the actual code for the software based on the design. It’s like building the software’s “skeleton” by writing the instructions that make it work.
Testing: Once the code is written, the team tests the software to find and fix any bugs or issues. It’s like checking the software for errors and making sure it works correctly.
Deployment: After testing, the software is ready to be deployed or released to users. It’s like delivering the finished product to customers so they can start using it.
Once the software testing phase is over and no bugs or errors left in the system then the final deployment process starts. Based on the feedback given by the project manager, the final software is released and checked for deployment issues if any.
Maintenance: Once the software is deployed, it may require ongoing maintenance, such as fixing bugs, making updates, or adding new features, to keep it running smoothly and up-to-date.
Once the system is deployed, and customers start using the developed system, following 3 activities occur
- Bug fixing – bugs are reported because of some scenarios which are not tested at all
- Upgrade – Upgrading the application to the newer versions of the Software
Enhancement – Adding some new features into the existing software
Documentation: Throughout the SDLC process, the team creates documentation, such as user manuals or technical guides, to help users understand and use the software effectively.
SDLC is like a roadmap that guides software development teams in creating software applications in a structured and organized manner, ensuring that the software meets the requirements, is tested, and deployed successfully to users.
SDLC MODELS ?
The Software Development Life Cycle (SDLC) refers to the process used by software development teams to design, develop, test, and deploy software applications. There are several different SDLC models that organizations can follow, depending on their requirements, resources, and project goals. Here are some of the commonly used SDLC models:
Waterfall Model: The Waterfall model follows a linear and sequential approach, where each phase of the SDLC is completed before moving on to the next. It includes phases such as requirements gathering, design, development, testing, deployment, and maintenance. This model is best suited for projects with well-defined requirements and stable scope.
Agile Model: Agile models, such as Scrum, Kanban, and Lean, are iterative and incremental in nature. They prioritize flexibility and collaboration, with frequent feedback loops and continuous improvement. Agile models are ideal for projects with evolving requirements and dynamic environments, where regular adaptation and quick response to changes are needed.
Iterative Model: The Iterative model involves repetitive cycles of the SDLC phases, with each cycle refining and improving the software based on feedback and lessons learned. It allows for incremental development and feedback-driven iterations, enabling the team to refine the software gradually.
Spiral Model: The Spiral model combines elements of both the Waterfall and Iterative models. It involves iterative cycles that include planning, risk analysis, development, and testing, with a focus on managing risks throughout the project. It is particularly useful for complex projects with high levels of uncertainty and risk.
V-Model: The V-Model is a variation of the Waterfall model, where testing is emphasized at every stage of the SDLC. It involves creating a parallel testing process that aligns with each phase of development, ensuring thorough testing and verification of the software.
Rapid Application Development (RAD) Model: The RAD model focuses on quickly building prototypes and involves rapid iterations based on user feedback. It emphasizes speed and flexibility, with a goal to deliver a working prototype as quickly as possible and refine it based on feedback.
These are some of the commonly used SDLC models. The choice of SDLC model depends on various factors such as project requirements, team size, complexity, and organizational culture, and it is important to select the right model that best fits the specific needs of the project.
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