Indifference Quality Level (IQL)
The point that divides acceptable from unacceptable performance.

I/MR Chart
The I/MR chart is a combined chart consisting of: 'individuals' (I) chart with values of each individual observation that provides a means to assess process center; and a 'moving range' (MR) chart with the range calculated from subgroups created from successive observations that provides a means to assess process variation. I/MR chart is used to draw a combined control chart for assessing whether process center and variation are in control when your data is individual observations. When subgroups are available use an X-Bar & R Chart.

Inspection
Activities, such as measuring, examining, testing, gaging one or more characteristics of a product or service, and comparing these with specified requirements to determine conformity.

Interim Approval
Permits shipment of products for a specified time period or quantity.