TS ISO 7870-8

TS ISO 7870-8 is a standard concerned with how control charts are applied in short-run production and small mixed batches. Its focus is the adaptation of regular variables control charts to situations where the monitoring sample size is limited to one. The aim is to help make sources of variation easier to understand so the process can be managed more effectively.

The role of control charts in short-run and small-batch processes

From a general technical perspective, control charts are used to distinguish common-cause variation from special-cause variation over time. In short production runs or small mixed batches, the usual sampling approach is not always practical, so monitoring may rely on individual observations, successive product families, or similar product groups. In these settings, the key challenge is to compare data against an appropriate reference and interpret natural process variation without creating unnecessary alarms.

What the standard provides

• Ways to adapt variables control charts to short-run production conditions.
• Tools that can be used when the monitoring sample size is restricted to one.
• A framework for understanding the sources of variation in small mixed batches.
• Support for interpreting and managing process behaviour more effectively.

The standard therefore concentrates less on the manufacturing process itself and more on how statistical process control can be applied when data are limited. It is especially relevant where production changes frequently, where different products pass through the same process in small lots, and where practical monitoring needs to work with sparse observations.