Cycle Time Variance

Meaning

Temporal measurement identifies the gap between the planned duration of a task and the actual time taken to complete it. High cycle time variance indicates a process that lacks stability and predictability. Production managers track this figure to identify hidden waste or technical bottlenecks.

Results are calculated by subtracting the target time from the observed time for each completed unit.

Temporal Deviation

Large deviations from the mean suggest that external factors are interfering with the steady state of the assembly line. When cycle time variance increases, it disrupts the flow of materials to downstream stations. The resulting unevenness forces higher buffer stocks to prevent line stoppages.

Process Stability

Statistical control limits define the acceptable range for these fluctuations during a normal run. A process is considered stable only when the measured variance remains within three standard deviations of the average. If the data points drift outside these bounds, the system requires immediate recalibration or maintenance.

Resource Impact

Labor planning becomes difficult when the time required for a task is unpredictable. Excess variance leads to overtime costs because the shift must extend to meet the daily volume target. The cost of calling a production run ready is premature if the variance has not been narrowed during the pilot phase.

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