Fast, Cheap, or Good

Sleep, study, and a social life: choose two, because you can’t have all three. At least, that’s what an old student proverb would have us believe. There is a similar “Iron Triangle” in project management: scope, time, and cost. You can do something faster, but it’ll cost more or be smaller in scale. You can do something bigger, but it’ll take more time or cost more. You can do something more cheaply, but it’ll end up slower or smaller. Explore the tools below for navigating these pressures, then discuss with your team: are there times when we might want something to be smaller, slower, or more expensive?

Kanban | Gantt Charts | Harmonogram | Dependencies | Risk Register
Stakhanovite Movement | Critical Path Method | Program Evaluation and Review Technique

The Sydney Opera House was promised in 1957 for $7 million and four years. It opened in 1973 — $102 million and a decade late. Its sails were so ambitious that something had to give: time and money. That is the Iron Triangle — fix one of scope, time, and cost, and the other two move.

Key concepts

The Iron Triangle: A project balances scope (how big), time (how fast), and cost (how cheap) — improving one corner forces a trade-off on another; you pick priorities but can't escape the triangle.
Trade-offs: The core truth beneath project management: you cannot optimize everything at once — every plan is a negotiation about what to sacrifice, so the real skill is choosing which corner gives way.
Constraints As Design: Limits aren't just obstacles — deliberately sacrificing speed or budget can be a creative strategy: going slower for quality, or smaller for focus, is a choice, not a defeat.
When Worse Is Better: Sometimes smaller, slower, or pricier is the right call — for craftsmanship, safety, sustainability, or meaning: a handmade chair, an aged cheese, a cathedral built over centuries.

What to know

01
Every tool here manages trade-offs, not escapes them — Kanban limits work, the Critical Path Method protects time, a Risk Register hedges uncertainty, but none lets you have scope, speed, and cheapness at once, which is the Iron Triangle's whole point.

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