A specification for a piston ring, for example, might specify that the diameter be 74mm +/- 0.05mm. Specifications are normally defined in terms of nominal (+/-) tolerances or ranges (low to high. In other words, they define what is expected from an item for it to be usable. Specification Specifications define product requirements. Similarly the lower specification limit (LSL) is the lower limit of the specified range. The upper specification limit (USL) is the upper limit of the specified range. Specifications: Specifications define product requirements.To understand Cp and Cpk you must have an understanding of the following terms: These indices, which are a fairly recent addition to the field of statistical process management, greatly simplify the management of statistically controlled processes. Cp and Cpk, commonly referred to as process capability indices, are used to define the ability of a process to produce a product that meets requirements.
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