The vocabulary of real production scheduling

Scheduling that respects the real, limited capacity of each machine, operator, and tool.

Recalculating the production schedule continuously as floor conditions change.

The resource whose limited capacity governs the throughput of the whole factory.

Any finite resource that limits how much work the factory can complete in a period.

The condition where the floor believes and executes the schedule the planner publishes.

When the schedule changes so often that the floor cannot rely on it.

The unpredictable variation in setup, run, and queue times that makes plans drift from reality.

The architectural choice between scheduling against real capacity or assumed unlimited capacity.

The accumulating gap between the published schedule and the real state of the floor as time passes.

The real, bookable hours on each resource after subtracting maintenance, calibration, training, and known constraints.

Distributing work across alternate resources so no single machine is overloaded while others sit idle.

The single resource whose capacity sets the throughput of the whole factory at a given moment.

A manual change a planner makes to the auto-generated schedule to reflect a constraint the system did not see.

Ordering jobs on a machine to minimize total changeover time across a batch.

The time a job waits in front of a work center before it actually starts processing.

Telling each operator and machine which job to run next, in what order, right now.

A grouping of one or more machines or stations that share routing and capacity.

Moving a job from its planned machine or partner to an alternate when conditions change.

The current priority sequence of jobs an operator or work center should run next.

The inherent variation in setup, run, queue, and external times that makes any static plan drift from reality.

The fixed sequence of operations a part must travel through, including precedence, splits, and merges.

Engineering and scheduling techniques that shorten changeover time between jobs.

The growth of work waiting in front of a resource when arrival rate exceeds processing rate.

Operations performed by external partners — heat treat, plating, anodize, NDT — that have their own queues and slip patterns.

All started but not-yet-completed work physically on the floor — money tied up in motion.

The fraction of scheduled time a machine is actively producing — useful only when interpreted alongside flow.

The percentage of orders that ship on or before the customer-promised date — the primary scheduling KPI.

Scheduling work on automated cells by reasoning about pallets, not just machines.

Running CNC machines unattended outside of staffed shift hours.

A point-in-time copy of ERP data used to generate a schedule that goes stale immediately.