# Agile vs Waterfall

URL: https://softwaredictionary.org/compare/agile-vs-waterfall
Last updated: 2026-09-30

In short: Agile ships working software in short cycles and adapts the plan to feedback, while Waterfall moves through fixed phases from requirements to release.

## What is the difference between Agile and Waterfall?

Agile is an approach to software development, described in the 2001 Agile Manifesto, that delivers software in small increments and welcomes changing requirements. Waterfall is a traditional, sequential model in which each phase (requirements, design, implementation, testing and deployment) is finished before the next one begins.

The key difference is how each one handles change and uncertainty. Waterfall assumes requirements can be understood up front, so it invests in detailed planning and documentation and delivers the product at the end. Agile assumes requirements will change, so it plans in short cycles, gets feedback from real users early and treats the plan as something to revise.

Agile is an umbrella for frameworks such as Scrum and Kanban, while Waterfall is a single process model. Many organizations blend them, for example using up-front planning and fixed milestones for contracts or hardware, and Agile iterations for the software work inside those milestones.

A common misconception is that Agile means no planning or no documentation. Agile teams plan constantly, just in smaller pieces, and write the documentation that proves useful rather than everything in advance.

| Aspect | Agile | Waterfall |
| --- | --- | --- |
| Structure | Short, repeated iterations of a few weeks or less | Sequential phases, each finished before the next |
| Requirements | Expected to change and refined continuously | Defined and signed off at the start |
| Delivery | Working software early and often | The full product near the end of the project |
| Customer involvement | Ongoing feedback throughout the project | Mainly at the start and at final acceptance |
| Handling change | Welcomed; the backlog is reprioritized | Costly; usually needs a formal change request |
| Documentation | Just enough, kept close to the work | Extensive, produced at each phase |
| Best for | Products with uncertain or evolving requirements | Fixed-scope, heavily regulated or hardware-dependent projects |

## Choose Agile when

- Requirements are unclear or likely to change.
- Users can give feedback throughout the project.
- Delivering value early matters more than a fixed final scope.

## Choose Waterfall when

- Scope, budget and deadline are fixed by contract.
- Requirements are well understood and stable.
- Regulations demand full documentation and sign-off at each phase.

## Frequently asked questions

**Is Agile better than Waterfall?**

Not universally. Agile suits projects where requirements evolve and feedback is available, while Waterfall can work well for stable, well-understood, heavily regulated or fixed-contract projects.

**Is Scrum the same as Agile?**

No. Agile is a set of values and principles, and Scrum is one specific framework for putting them into practice, with sprints, defined roles and regular events.

**Can you combine Agile and Waterfall?**

Yes. Hybrid approaches are common, such as planning major milestones up front in Waterfall style and building the software inside them in Agile iterations.

---

Software Dictionary: https://softwaredictionary.org/ · https://softwaredictionary.org/llms.txt