Software Development Life Cycle (SDLC)

What is SDLC?

The Software Development Life Cycle is a structured process for building software — from idea to launch and maintenance. It ensures quality and predictability.

The 6 Phases

1. Planning — define goals, scope, resources.
2. Analysis — gather requirements.
3. Design — architecture and UI.
4. Development — write the code.
5. Testing — find and fix bugs.
6. Deployment & Maintenance — launch and update.

Popular SDLC Models

Model	Approach
Waterfall	Linear, sequential
Agile	Iterative sprints
Scrum	Agile framework
DevOps	Continuous delivery

Waterfall vs Agile

• Waterfall — finish each phase before the next. Good for fixed requirements.
• Agile — build in small iterations with frequent feedback. Most popular today.

FAQs

Which model is best?

Agile for most modern projects due to flexibility. More in our Software guides.

What is Agile?

An iterative approach delivering working software in short cycles (sprints).