Factory Physics -- Notation Guide

• - number of machines in a workstation

• - number of laborers

• - WIP level

• - buffer level.

• - batch size

• - maximum batch size

• - time (usually denotes average time)

• - rate

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• - Capacity

• - Throughput

• - Cycle Time

• - cycle time of the -th station given WIP level of

• - Work in Process

• - Wait in batch time

• - Utilization

• - bottleneck rate

• - raw process time

• - critical WIP

• - demand

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• - pertaining to best case
• - pertaining to worst case
• - pertaining to practical worst case
• - pertaining to a CONWIP line

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• - coefficient of variation

• - availability

• - mean time to failure

• - mean time to repair

• - natural process time

• - natural process rate

• - effective mean process time

• - effective capacity

• - setup time

• - pertaining to setups

• - pertaining to arrivals

• - pertaining to departures

• - pertaining to a queue.

• - pertaining to a quantity measured under ideal conditions

• - pertaining to a practical (what can be observed) quantity.

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• - throughput efficiency
• - utilization efficiency
• - inventory efficiency
• - cycle time efficiency
• - lead time efficiency
• - service efficiency
• - quality efficiency

Links §

• Hopp and Spearman