Скачать или смотреть The Triple Constraint Explained — The Core Rule Every Project Manager Must Know

“You can’t change one side without shaking the whole project — here’s the simplest rule that controls everything you deliver.”
The Triple Constraint, also known as the Project Management Triangle, defines the three forces that shape every project: Scope, Time, and Cost. These three constraints are tightly interconnected — if one changes, the other two must adjust. Want more features? You’ll need more time or budget. Want faster delivery? Reduce scope or increase cost. Want to cut costs? You must reduce scope or extend schedule.

Understanding this triangle helps project managers balance expectations, negotiate trade-offs, and keep stakeholders aligned. At its heart, the Triple Constraint teaches one truth: You can’t have everything — but you can choose what matters most.