Waterfall

What is Waterfall?

Waterfall is one of the first software development models modeled after conventional manufacturing processes, where each stage precedes the next. Returning to the previous stage is difficult. Discovering a bug in a previous stage means that you can only return to the bug once the software is in use.

Phases of the Waterfall model

1. Requirements
2. Analysis
3. Design
4. Coding and implementation
5. Testing
6. Operation and deployment
7. Maintenance

Source