TS ISO 7870-2

TS ISO 7870-2 is the Turkish adoption of the standard that provides guidance on the use and understanding of Shewhart control charts for statistical process control. In general technical terms, control charts help distinguish common-cause variation from special-cause variation over time, and the Shewhart approach remains one of the most established ways to monitor short-term process behavior.

The technical role of Shewhart control charts

A Shewhart control chart typically brings together a center line, upper and lower control limits, and data points plotted in time order. In general practice, this format helps users see whether the natural variation of a process remains within expected statistical boundaries. For that reason, control charts are widely used in manufacturing, service operations, and broader improvement programs to understand process stability and signal detection.

What the standard’s guidance is about

The focus of this document is guidance on how to use and understand the Shewhart control chart approach. Its practical value lies in giving users a common framework for interpreting statistical process control, choosing an appropriate chart concept, and reading patterns on the chart in a technical way. In practice, different Shewhart chart families are used for variable data and attribute data, but this record does not, by itself, detail a specific test procedure, numerical acceptance limit, or mandatory calculation set.

• Explains the control-chart logic used to monitor process behavior.
• Covers the place of the Shewhart approach within statistical process control.
• Provides guidance for interpreting chart signals.
• Supports understanding of the common-cause and special-cause distinction used in practice.