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Planning & Processnoun · /ˈwɔːtərfɔːl/

waterfall

In simple English

Waterfall is named after the way water flows down a waterfall—in one direction only, with no going back up. In waterfall project management, teams move through distinct sequential phases: first gathering all requirements, then designing the entire system, then building it, then testing it, and finally deploying it. Once a phase is complete, moving backward to change earlier decisions is costly and time-consuming. This approach works well for projects with clear, fixed requirements that are unlikely to change, such as embedded systems, hardware integration, or regulatory-heavy projects. However, waterfall is considered rigid compared to modern Agile methods, which allow for iterative changes and continuous feedback. In tech companies, waterfall is often discussed in historical or comparative contexts when explaining why teams have shifted to more flexible methodologies.

Understanding what waterfall methodology means and how it differs from Agile in software development.

At a glanceCEFR B2
Commonness4/5
Versatility4/5
FormalityCasualFormalNeutral
Spoken ↔ WrittenSpokenWrittenBoth
Directness ↔ DiplomaticDirectDiplomaticDirect
RegionUS and UK
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Say it like this

✓We are using a waterfall approach for this project
✓This is too waterfall for a startup
✓We moved away from waterfall to Agile

Real examples

in a standup

"Since we are on a waterfall timeline, we cannot add new features until Q3."

in a planning meeting

"The problem with waterfall is that testing happens at the very end, so bugs discovered then are expensive to fix."

in a retrospective

"We tried waterfall for the compliance project, but it made it difficult to respond to client feedback."

Don't say this

Handle with care. Often confused with Agile. Waterfall is linear and sequential; Agile is iterative. Do not use waterfall to mean any project management method.

✕We are doing waterfall sprints next month.
✓We are using waterfall methodology, which does not involve sprints.— Sprints are an Agile concept, not a waterfall concept. Waterfall does not use sprints.
✕Let us waterfall this feature quickly.
✓Let us break this feature into smaller pieces using Agile instead of waterfall.— Waterfall is not a verb and does not mean to speed something up. It is a planning methodology.
✕This requirement needs waterfall attention.
✓This requirement needs careful upfront planning, like in a waterfall approach.— Waterfall describes a methodology, not a type of attention or focus.

Other forms

noun

waterfall

"Waterfall is a traditional project management method."

adjective

waterfall (attributive)

"A waterfall project requires detailed upfront planning."

Often used with

waterfall approachThe most common collocation; refers to using waterfall methodology
waterfall methodologyFormal way to describe the waterfall system
waterfall modelTechnical term for the waterfall development model
waterfall projectA project organized using waterfall principles
move away from waterfallCommon phrase when teams transition to Agile

Similar words

sequential methodologyMore descriptive but less commonly used in tech
phase-gate approachTechnical term emphasizing the gated phases; more formal

Opposites

AgileiterativeincrementalScrum

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Practice

Try it

4 quick exercises

Pick the most natural phrasing

1. Your manager asks about project planning. Which sounds most natural?

Complete the sentence

2. Our enterprise client requires a _______ approach due to regulatory compliance.

Spot the mistake

3. Which sentence uses waterfall incorrectly?

Rewrite naturally

4. Rewrite using waterfall: 'We decide everything first, then build, then test, then release everything at once.'

Questions

Quick poll

Have you said "waterfall" in a standup this week?

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