Waterfall Model: The Waterfall Model is a linear and sequential approach where each phase must be completed before moving to the next. It typically consists of stages like requirements, design, implementation, testing, deployment, and maintenance. While its simplicity makes it easy to understand and use, it can be less adaptive to changes encountered during development.
- Agile Model: Agile is an iterative and incremental approach that emphasizes flexibility and collaboration. It involves breaking the project into small, manageable iterations (sprints) and allows for changes and adaptations throughout the development process. Agile promotes customer involvement, continuous feedback, and the delivery of a minimum viable product (MVP) in short development cycles.
- Iterative Model: The Iterative Model focuses on repeating cycles, allowing for the refinement of the software in each iteration. It involves revisiting and improving upon the design, implementation, and testing in multiple cycles until the desired product quality is achieved. This model is flexible and accommodates changes effectively.
- Spiral Model: The Spiral Model combines the idea of iterative development with elements of the Waterfall Model. It involves repeating cycles, known as spirals, where each cycle represents a phase in the SDLC. This model incorporates risk analysis and allows for risk-driven decision-making throughout the development process.
- V-Model (Verification and Validation Model): The V-Model is an extension of the Waterfall Model, with a focus on testing at each stage. It involves a corresponding testing phase for each development phase, forming a V-shaped structure. This model ensures that testing is integrated into each step of the development process, leading to higher-quality software.
- Big Bang Model: The Big Bang Model is an informal and less structured approach where developers start coding without a predefined plan. This model is suitable for small projects or experimental applications where requirements are unclear, and the development team is exploring possibilities.
- Incremental Model: The Incremental Model divides the software into small parts or increments, with each increment representing a portion of the final system. Developers gradually build and add functionality to these increments, allowing for partial delivery of the system at various stages.
- RAD Model (Rapid Application Development): The RAD Model is a fast-paced development approach that emphasizes quick development and iteration. It involves user feedback and collaboration and is suitable for projects where time-to-market is a critical factor. RAD incorporates prototyping and iterative development to achieve rapid delivery.
- DevOps Model: DevOps is not a traditional SDLC model but rather a culture and set of practices that promote collaboration between development and operations teams. It emphasizes automation, continuous integration, continuous delivery, and rapid deployment to enhance efficiency and reduce time to market.
- Feature-Driven Development (FDD): Feature-Driven Development is an iterative and model-driven approach that focuses