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Constraint [kuh n-streynt]
Constraints are limitations that are outside the control of the project team and need to be managed around.
They are not necessarily problems. However, the project manager should be aware of constraints because they represent limitations that the project must execute within. Date constraints, for instance, imply that certain events (perhaps the end of the project) must occur by certain dates.
Resources are almost always a constraint, since they are not available in an unlimited supply.