Control charts — Part 2: Shewhart control charts

This technical specification outlines the principles and practical applications for constructing and interpreting Shewhart control charts. It provides detailed guidance on the methodology used to monitor process stability and variability over time. The document defines the necessary steps for selecting appropriate chart types based on specific data characteristics and process requirements. It includes instructions for calculating control limits and identifying patterns that indicate special cause variation. The content focuses on the statistical foundations that support the detection of process shifts. It addresses the interpretation of data points relative to control boundaries and the actions to be taken when signals of instability are observed. The guidance covers both variable and attribute data scenarios commonly encountered in quality management systems. It serves as a reference for implementing statistical process control techniques without altering the fundamental approach established by the originating international body. The information is presented to facilitate consistent application of these charts in manufacturing and service environments.