CHAPTER 4
The Hierarchy of Constraints
We’ve identified that one of the most powerful secrets of the triple constraints comes from ranking them in the order of their priority and impact on the project: deciding which pig is more equal than the other two.
The three terms we use to describe the hierarchy of the triple constraints are:
• Driver
• Middle constraint
• Weak constraint.
The driver is the leg of the triple constraint that cannot fail without dragging the rest of the project down to failure along with it. Flexibility of the driver is not necessarily zero, but it has less flexibility than the other two legs. The consequence of failure ...
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