Which project management methodology should you use for your next project? Understanding the differences between agile's iterative approach and waterfall's linear structure helps you choose the right methodology for your team and requirements.
| Aspect | Waterfall | Agile |
|---|---|---|
| Approach | Linear, sequential | Iterative, incremental |
| Requirements | Defined upfront | Evolving throughout |
| Customer Involvement | Limited after start | Continuous collaboration |
| Changes | Difficult, costly | Embraced, expected |
| Testing | After implementation | Throughout each sprint |
| Team Structure | Specialized roles | Cross-functional, self-organizing |
Waterfall methodology, also known as the linear sequential lifecycle model, is defined by its linear, structured approach to project management. It consists of a series of steps completed in sequential order within the software development life cycle. Dr. Winston W. Royce documented this approach in his 1970 paper "Managing the Development of Large Software Systems."
In contrast to waterfall, agile is defined by its iterative approach. Instead of drafting lengthy project requirements at the onset, an agile team breaks the product into specific features and tackles each under a specific time constraint called a sprint. Agile requires a cross-functional, self-organizing team typically of five to nine members.
Waterfall's detailed documentation enables new programmers to onboard quickly and provides clear scope for budgets and timelines. However, clients may find it difficult to outline all requirements at the beginning, and minimal collaboration during development can lead to costly changes if the product doesn't meet expectations.
Agile embraces change and continuous customer collaboration, allowing teams to adapt as requirements evolve. Testing occurs throughout each sprint rather than at the end, catching issues earlier. The tradeoff is less upfront predictability in timelines and budgets.