“Should we use Agile or Waterfall?” That question comes up in almost every project. But it’s the wrong question. It doesn’t matter which methodology you choose. What matters is whether you deliver.

Waterfall: plan everything upfront, build, hand over at the end. Agile: plan a little, build a little, learn, adjust, repeat.

You can’t build half a bridge and test it with traffic. Waterfall works when requirements won’t change, changes are expensive, or you have a fixed-scope contract.

You think you know what clients want. You’re probably wrong. Agile works when requirements evolve, user feedback matters, or “done” is unclear at the start.

The trap: a consultant shows up and says “we’re doing Agile.” The client has a fixed-price contract with a hard deadline. The consultant insists on sprints and retrospectives, the project fails. Your job is not to impose a methodology. It’s to deliver results within the constraints you’re given.

Real projects don’t fit neat categories. Migration project? Waterfall for infrastructure, Agile for features on top. ERP? Waterfall for the core system, Agile for custom workflows.

Junior: “We should use Agile because Agile is better.” Senior: “Iterative for customer-facing features because requirements are unclear. Phased for the backend migration because the technical sequence is fixed.”

Clients don’t remember whether you used Agile or Waterfall. They remember whether you delivered.