A planning system can report that an order should start tomorrow even when the required machine is already fully loaded. The difference often comes from whether the model checks available capacity.
Infinite planning explained
Infinite capacity planning assigns work based on requirement dates without strictly preventing overload. It is useful for quickly estimating demand on resources and highlighting overload periods, but not proof that a delivery date is achievable.
Finite scheduling explained
Finite scheduling assigns operations within the available work-center calendar. It accounts for machine occupancy, shift time, maintenance windows and sequencing rules. The output is more realistic but depends on accurate master data.
Simple example
A work center has eight usable hours tomorrow. Three jobs require four, three and three hours. Infinite planning may place all ten hours tomorrow; finite scheduling must move at least two hours or use an approved alternative resource.
Where companies struggle
Cycle time errors, missing setup assumptions, unrecorded breakdowns and incorrect alternate routes make any schedule unreliable. The planner needs a way to override exceptions with documented reasons.
Conclusion
Use infinite planning to understand load and finite scheduling to test execution feasibility.
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