Control chart for percent defective (P-CHART)

P-CHART is the most versatile and popular control chart.  To use P-CHART, quality inspectors classify sample items into two groups:  good or bad.  This can mean defective or non-defective, conforming or non-conforming to specifications, acceptable or unacceptable, or other definitions in which there are only two categories of results.

Brookshire Cookware Corporation, a producer of pots and pans located in Brookshire , Texas , uses P-CHART worksheets to monitor the quality of component parts received from its Mexican suppliers.  At the end of each business day, Brookshire faxes a copy of each P-CHART to its suppliers.  This feedback helps maintain a good working relationship with suppliers and alerts them to potential problems.