A process capability index is based on specification limits,
also named as tolerances. We assume two-sided specification
limits defined by the lower specification limit (LSL) and the
upper specification limit (USL), and which generally indicate
ranges of acceptance quality characteristics. In other words,
a product is considered as acceptable if its characteristics are
within the specification interval [LSL, USL]. For example,
the specification limits for the volume of bottles may be specified
as 2 liters ±0.05 liters, which indicates that LSL ¼ 1:95
liters and USL ¼ 2:05 liters. One-sided specification limits
can be also defined. For example, the volume of bottles may
have the lower specification limit LSL ¼ 1:95, but not an
upper specification limit (see also Montgomery, 2009, p. 9).
A process capability index is based on specification limits,also named as tolerances. We assume two-sided specificationlimits defined by the lower specification limit (LSL) and theupper specification limit (USL), and which generally indicateranges of acceptance quality characteristics. In other words,a product is considered as acceptable if its characteristics arewithin the specification interval [LSL, USL]. For example,the specification limits for the volume of bottles may be specifiedas 2 liters ±0.05 liters, which indicates that LSL ¼ 1:95liters and USL ¼ 2:05 liters. One-sided specification limitscan be also defined. For example, the volume of bottles mayhave the lower specification limit LSL ¼ 1:95, but not anupper specification limit (see also Montgomery, 2009, p. 9).
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