The index indicates that manufacturing processes are capable of good (of which measured between USL and LSL) regularly and most of the production has met the design?
Indicate that the process is capable of producing good. (Of which measured between USL and LSL) and was consistently one of the most manufacturing to meet the design or not.
The index indicates that the process has the ability to produce good (measured between USL LSL) and thermodynamic equation has always much and produced most of the value of design.