USL is the upper specification limit, while LSL is the lower specification limit. USL and LSL are dictated by / based on customer expectations. Some processes have only USL, some others have only LSL, and still others have both USL and LSL. (for example, the pizza example has only USL). Software processes have both USL and LSL.Companies may have different kinds of processes for different customers, or may have the same processes for different customers. The types of processes to be followed are dictated by business demands, as customers have varying expectations.
UCL is the upper control limit, LCL the lower control limit. Control limits are three times the standard deviations (3Sigma always) on either side of the mean.
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