If an activity requires a resource and cannot be scheduled unless that resource is available, the “ON” option will cause the scheduler to enforce that constraint. A constraint is a limitation on the availability of a resource. For example, if an activity needs 3 widgets to be performed but there are only 2 available, the activity is “constrained” by the insufficiency of the resource. The default setting is “on” causing the scheduling logic to not schedule an activity if the required resources are not sufficiently available. However, in some scenarios, you may wish to turn off the constraint, i.e. to ignore the requirement altogether. You can do this by selecting the “OFF” option. The scheduler will ignore the resource requirement when the “OFF” option is selected. The “TRACK” option allows the activity to be scheduled even if the resource is not available, but the logic will decrease the resource availability as if the activity had actually used the resource. Because of this, you can go to the resource profiles to see exactly when, and in what quantity, resources would have to be increased in order to make the schedule feasible. This feature facilitates strategic planning and resource management; it allows the FAST system to be used for “WHAT-IF” planning, facility sizing, equipment acquisition plans, personnel hiring requirements and similar strategic planning purposes.
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