TS ISO 7870-7

TS ISO 7870-7 is the standard in the ISO 7870 series that addresses multivariate control charts and provides a framework for monitoring multiple measured characteristics together in statistical process control (SPC) when the data are variables data. Its focus is on reading process behaviour as a combined system rather than as isolated measurements.

What multivariate control charts represent

In general technical terms, multivariate control charts are used when several quantitative characteristics of a product, process, or operation are monitored at the same time. Measurements such as temperature, pressure, dimensions, weight, or chemical composition may each be meaningful on their own, but their joint behaviour can reveal process shifts, correlations, and unusual combinations earlier than separate charts would. Unlike univariate control charts, this approach takes the shared variation among variables into account.

How this standard is positioned

The scope of this standard is to describe the construction and use of multivariate control charts and to establish methods for understanding and applying this generalized control-chart approach in SPC. It therefore supports the broader logic of multivariate process monitoring rather than focusing on a single chart type only. The emphasis is on situations where the characteristics being measured come from variables data.

In practice, such charts are valuable in quality control, process monitoring, and statistical evaluation whenever several measurements need to be interpreted together. The terminology referenced from ISO 3534-2 supports a consistent statistical vocabulary for this field.