Scrum guide · Scrum basics
Scrum vs Waterfall: Key Differences Explained
Scrum and Waterfall represent two different ways of managing work. Waterfall plans everything first and delivers at the end; Scrum delivers in short Sprints and adapts based on feedback.
Key takeaways
- Waterfall plans up front; Scrum plans every Sprint.
- Scrum delivers increments; Waterfall delivers at the end.
- Hybrids are common.
Side by side
| Waterfall | Scrum | |
|---|---|---|
| Planning | Detailed plan up front | Sprint by Sprint, with a Product Goal |
| Delivery | At the end | A usable Increment every Sprint |
| Requirements | Fixed in a specification | Ordered in a Product Backlog that evolves |
| Roles | Project manager directs | Product Owner, Scrum Master, Developers |
| Change | Through change requests | Re-order the backlog between Sprints |
| Testing | A late phase | Within every Sprint |
| Progress | Phase completion | Working Increments |
When Waterfall is better
- Requirements are stable and fully known.
- The output only has value when complete.
- Regulation requires sequential, approved phases.
When Scrum is better
- The solution is uncertain and needs discovery.
- Users can give regular feedback.
- Speed to market matters.
Hybrid
Many organisations keep Waterfall-style governance and milestones, with Scrum teams delivering within them. See Agile vs Waterfall.
Frequently asked questions
Which is faster, Scrum or Waterfall?
Scrum delivers usable results much sooner, though total project duration depends on scope.
Can a project switch between Scrum and Waterfall midway?
Yes. Moving from Waterfall to Scrum works best at a phase boundary, by turning the remaining requirements into a Product Backlog.
What is the main difference between Scrum and Waterfall?
Waterfall completes each phase, such as requirements, design, build and test, in sequence and delivers at the end. Scrum delivers a usable Increment every Sprint and adapts plans based on feedback.
Which is better, Scrum or Waterfall?
It depends on the work. Scrum suits uncertain, changing requirements; Waterfall suits stable, well-understood work or regulated projects needing sequential approvals.
Which is cheaper, Scrum or Waterfall?
Neither automatically. Scrum can reduce waste by stopping low-value work early and finding problems sooner, but total cost depends on scope, team and context.
How is testing different in Scrum and Waterfall?
In Waterfall, testing is usually a separate late phase. In Scrum, testing happens within every Sprint so each Increment meets the Definition of Done.
How does documentation differ in Scrum and Waterfall?
Waterfall typically relies on detailed upfront documents such as specifications. Scrum favours just enough documentation, with the Product Backlog and working Increments as the main sources of truth.
Who manages the project in Scrum and Waterfall?
In Waterfall a project manager usually plans and directs the work. In Scrum, the Product Owner decides priorities, the Developers manage their own work and the Scrum Master supports effectiveness.
Can Scrum and Waterfall be combined?
Yes. A hybrid might use predictive governance, milestones and budgets while Scrum teams deliver within them. See Agile vs Waterfall.
Is Scrum or Waterfall better for construction projects?
Physical construction usually follows a predictive approach because the build sequence is fixed. Scrum ideas can still help in design phases or for managing internal work.
How are changes handled in Scrum vs Waterfall?
Waterfall handles changes through formal change requests and change control. Scrum handles them by re-ordering the Product Backlog, so changes can take effect from the next Sprint.