LSL - Lower Specification Limit

LSL, (Lower Specification Limit), is the smallest amount in which a process or product is within the acceptable performance limits.

This limit may be close to 3 sigma lower than the nominal or expected mean of any process or product.

There is usually a USL, (Upper Specification Limit) also. A lot of products will only have one limit. Either an upper or lower control limit. These are sometimes called 'One Sided Specs'. A Cp cannot be calculated for one sided specs.

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