Waterfall: Linear and Predictable
Waterfall is a sequential approach where each phase — from requirements to delivery — is completed before the next begins. It's ideal for projects with fixed scope and minimal changes.
Agile: Adaptive and Iterative
Agile is a flexible, iterative model focused on collaboration and continuous delivery. It embraces change and works well in fast-moving or uncertain environments.
Key Differences
- Planning: Waterfall requires full planning upfront; Agile plans in cycles (sprints).
- Change: Waterfall resists change; Agile welcomes it.
- Delivery: Waterfall delivers at the end; Agile delivers in increments.
Which One to Use?
Use Waterfall when requirements are clear and stable. Use Agile when flexibility and stakeholder collaboration are crucial to success.