Statistical process control: control charts that catch drift early
Apply SPC where it works — control chart selection, rational subgrouping, capability indices, and the reaction plans that turn charts into control.
Statistical process control (SPC)
Statistical monitoring of process variation and stability.
Statistical process control uses control charts and process data to distinguish common-cause variation from special-cause signals. It monitors process stability and capability; it is not simply a final inspection pass/fail test.
See also: First-pass yield (FPY) · Nonconformance · Golden batch
Use the concept: Cp, Cpk, Pp & Ppk calculator · Downtime log template · MTBF, MTTR & availability calculator
In depth
Gauge R&R: how much variation is the gauge?
A gauge R&R study separates measurement error from real part-to-part variation, so you can tell whether a tolerance decision is trustworthy.
Takt time vs cycle time vs lead time: calculate the right clock
A worked shift example separates customer pace, observed process speed and end-to-end delivery time, with practical checks before changing the line.