TS ISO 7870-5

TS ISO 7870-5 focuses on specialized control charts used in statistical monitoring of processes. It provides guidance for understanding and using these charts when the conventional Shewhart control chart approach is not suitable, or when it is not sensitive enough to detect unnatural patterns of process variation.

Why specialized control charts matter

Control charts combine a centre line, control limits and the pattern of observations to separate routine process fluctuation from signals that suggest a change in behaviour. Shewhart charts are widely used in manufacturing and service settings, but they may be less effective for small shifts, long runs, trends, serial dependence or other subtle forms of variation. This part addresses chart families developed for such situations.

Technical context covered by this part

• The standard is part of the ISO 7870 series and positions specialized charts within the broader control-chart family.
• Its focus is on chart types that can be more suitable for distinguishing common-cause variation from unusual process patterns.
• The document serves as a guide for use and understanding where the Shewhart approach is not applicable or is less efficient.
• The underlying context is statistical process control and the interpretation of process behaviour over time.

In practical terms, this is less a single test method than a conceptual framework for selecting and interpreting control charts. It helps engineers, quality professionals and data-driven improvement teams understand when a classic chart may be adequate and when a more specialised charting approach is more informative.