c Chart, is used to graph the total number of nonconformities found in each piece or unit that is inspected in a constant sample size.

u Chart, is used to show how the process measured by the number of nonconformities per item or group of items, changes over time.

p Chart, the chart is the most commonly used attribute chart and is used to measure the proportion of defective or non conforming items within a sample or population.

np Chart, is used to show how the process, measured by the number of nonconforming items it produces, changes over time.