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Agile vs waterfall — which is right for my project?

Waterfall plans the whole scope up front and executes in sequence; agile delivers in short increments and re-plans as it learns. Choose waterfall when requirements are genuinely fixed and change is expensive — regulated builds, hardware, fixed-scope contracts. Choose agile when the requirements will change, which is most software.

The real variable is cost of change

Waterfall is optimal when change is expensive and knowledge is complete at the start; agile is optimal when change is cheap and knowledge arrives during the work. Framing it as modern-versus-obsolete misses the point — a bridge is not built in two-week increments, and a consumer app should not be specified for eighteen months.

Where waterfall genuinely wins

Fixed-price contracts with defined deliverables, regulated environments requiring up-front documented specifications, hardware dependencies with long lead times, and projects where integration cost makes incremental release impractical. Pretending these are agile-with-extra-steps produces the worst of both.

The hybrid most teams actually run

Fixed outer milestones with agile execution inside them: the contract or the launch date is committed, and the scope inside each increment flexes. That is what most agencies and product teams genuinely do, and calling it what it is beats performing pure scrum for a client who bought a fixed scope.

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Related questions

Can I run agile with a fixed deadline?

Yes — fix the date and flex the scope. Velocity tells you how much will realistically fit by that date, which turns 'will we make it' into an arithmetic question you can answer early enough to act on.

Does agile mean no documentation?

No. It means documentation that earns its place. A team wiki holding specs, decisions and the definition of done is entirely agile — and linking those pages to the issues that implement them, as Flocci Projects does, is how the documentation stays connected to reality.

What is the most common agile failure?

Adopting the ceremonies without the feedback loop: sprints with no working increment to inspect and retrospectives that change nothing. That produces waterfall with more meetings, which is worse than either approach done honestly.

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