SDLC

1. Overview

Definition: The SDLC is a systematic process for planning, creating, testing, and deploying software applications.
Phases:
- Requirement Analysis: Gather and analyze business requirements.
- Design: Create architecture and design for the software.
- Implementation (Coding): Translate design into the actual code.
- Testing: Validate that the software functions as intended.
- Deployment: Release the finished software to users.
- Maintenance: Fix issues and make updates post-deployment.

Waterfall Model:
- Linear and sequential approach.
- Each phase must be completed before the next begins.
- Best for projects with well-defined requirements.
Agile Model:
- Iterative and incremental approach.
- Encourages adaptability and flexibility throughout development.
- Involves continuous feedback and improvements.
V-Model (Validation and Verification Model):
- Extension of the Waterfall model.
- Testing phase is planned parallel to each development stage.
- Emphasizes the importance of validation and verification.
Iterative Model:
- Development is broken down into smaller parts.
- Each iteration uses feedback to refine the product.
- Welcomes changes even late in the process.
Spiral Model:
- Combines iterative development with the systematic control of the Waterfall Model.
- Focuses on risk assessment and incorporates user feedback.
- Repeated cycles (spirals) lead to gradual refinement.
DevOps Model:
- Integrates development and operations for streamlined processes.
- Focuses on automation and continuous integration/continuous deployment (CICD).
- Enhances collaboration and reduces time-to-market.
RAD (Rapid Application Development):
- Emphasizes rapid prototyping over extensive planning.
- Users are involved throughout the development process.
- Fast-paced, suitable for projects with time constraints.