BS ISO 7870-8:2017

Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions and symbols
4 How to select the correct type of Shewhart control chart
  for continuous variables data
5 How to prepare for short run, small mixed batch control
  charting
6 How to establish and apply short run, small mixed batch,
  control charts
Annex A (informative) - Reproducible copies of control charts
        forms and normal probability worksheet
Bibliography

Gives ways of applying regular variables control charts to short runs and small mixed batches where the sample size for monitoring is restricted to one and also provides a set of tools to facilitate the understanding of sources of variation in such processes so that the processes can be better managed.

This document describes ways of applying regular variables control charts to short runs and small mixed batches where the sample size for monitoring is restricted to one. It provides a set of tools to facilitate the understanding of sources of variation in such processes so that the processes can be better managed.

The charts described are process-focused rather than product-focused. The user can plot, monitor and control similar characteristics on different items, or different characteristics on an item, on a single control chart.

NOTE1 The terms short run and small batch size are not well defined. Here, short run and small batch size are taken to mean only a few items are manufactured before a different item is then produced.

NOTE2 For situations where the subgroup size is larger than one, other standards apply.