SDLC (Software Development Life Cycle)

 SDLC (Software Development Life Cycle) is a structured approach used for developing software systems. It provides a systematic framework to ensure high-quality software is delivered efficiently and effectively. The SDLC process typically consists of the following stages:

1. Requirement Gathering and Analysis

• Objective: Understand the needs of the customer and document requirements.
• Activities:
  • Collect functional and non-functional requirements.
  • Analyze the feasibility of the project.
• Output: Requirement Specification Document (e.g., BRD, SRS).

2. Planning

• Objective: Define the project scope, budget, timeline, and resources.
• Activities:
  • Develop project plans.
  • Define milestones and deliverables.
  • Risk analysis and mitigation planning.
• Output: Project Plan Document.

3. System Design

• Objective: Create a blueprint for the system.
• Activities:
  • High-Level Design (HLD) for architecture.
  • Low-Level Design (LLD) for modules and components.
• Output: Design Documents, System Architecture.

4.Development (Implementation)

• Objective: Write and integrate code to build the software.
• Activities:
  • Coding based on design documents.
  • Unit testing by developers.
• Tools: IDEs, programming languages, version control systems (e.g., Git).
• Output: Source Code.

5. Testing

• Objective: Verify that the software meets requirements and is free of defects.
• Activities:
  • Perform various testing types (e.g., functional, integration, performance, security).
  • Log and fix defects.
• Tools: Selenium, JUnit, LoadRunner, etc.
• Output: Test Cases, Test Results.

6. Deployment

• Objective: Release the software to production.
• Activities:
  • Deploy the software in the production environment.
  • Perform user acceptance testing (UAT).
  • Rollout the product to end-users.
• Output: Live Software.

7. Maintenance

• Objective: Ensure the system runs smoothly post-deployment.
• Activities:
  • Monitor performance.
  • Fix bugs and deploy updates.
  • Handle user feedback and implement enhancements.
• Output: Updated Software, Maintenance Reports.

Common SDLC Models:

1. Waterfall Model: Sequential and linear.
2. Agile Model: Iterative and collaborative.
3. V-Model: Validation and verification.
4. Spiral Model: Risk-focused iterative development.
5. Iterative Model: Repeated refinement.
6. DevOps: Focus on automation and continuous delivery.