c-Chart

Attribute control chart monitoring the count of defects per unit when opportunity is constant.

Examples

01The paint shop plots a c-Chart of surface defects per car body, with each body inspected the same way.
02In a supplier review, a c-Chart of solder defects per board shows a stable process, so the discussion moves to reducing the average rather than chasing single points.
03When the c-Chart shows 14 defects on one body against a UCL of 9, the body is held and the team checks the booth humidity log for that hour.