Repeatability
Repeatability is the degree to which the same measurement process returns the same result when the same operator measures the same item under the same conditions. In metrology, it is the variation attributable to the measurement device itself, and a component of precision distinct from reproducibility, which captures operator-to-operator or condition-to-condition variation.
On a shop floor, repeatability determines whether a scanner, scale, checkweigher, torque tool, vision system, or gage can be trusted when used repeatedly on the same part or lot to verify quantity, weight, dimension, or status. If the device is not repeatable, the same pallet, bin, or coil can be accepted on one scan and rejected on the next, creating false discrepancies in ERP, WMS, or MES records. In raw material tracking, repeatability keeps receipt, putaway, issue, and cycle-count transactions consistent, because the system depends on stable capture of the same SKU, lot, location, and quantity. Without it, inventory accuracy programs see noisy variance that gets mistaken for shrinkage, mispicks, or receiving errors. Automated replenishment and visibility tools also depend on repeatable sensor or scan data; poor repeatability weakens reorder-point logic, available-to-promise, and quarantine handling, leading to premature replenishment, blocked shipments, or delayed production release.
Is repeatability the same as inventory accuracy?
No. Inventory accuracy compares recorded stock to physical stock, while repeatability measures whether the measurement process itself gives the same result under unchanged conditions.
Why does repeatability matter in cycle counting?
A cycle count only improves inventory control if repeated counts of the same location produce consistent results; otherwise, apparent variances may come from the measuring system rather than from actual inventory.
What is the supply-chain consequence of poor repeatability in automated systems?
It degrades the reliability of on-hand visibility, reservation logic, and replenishment triggers, which can cascade into misallocation, expedited freight, and production interruptions.