Quick answer
The triple constraint (iron triangle): scope, time, cost — change one, the others move; quality sits in the middle; the negotiation every PM manages.
The triangle
Scope ↔ time ↔ cost — pull one corner and the others move; the constraint is the relationship.
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Quality in the middle
Cut scope, time or cost without adjusting the others → quality pays — the hidden variable.
The modern view
Agile loosens the triangle: fix time+cost, vary scope — the constraint holds, the variables swap.
Using it
When a stakeholder asks a change — show the triangle; the trade-off is the conversation.
Bottom line
The triple constraint (iron triangle): scope, time, cost — change one, the others move; quality sits in the middle; the negotiation every PM manages.
FAQ
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