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But obviously, hitting the exact target is practically not possible, and therefore customers give the USL and LSL.

USL (Upper Specification Limit) and LSL (Lower Specification Limit), these are the boundaries of the target which customers already take into consideration. Customers give the target with some specification limits i.e. Here the target means the process target given by the customer.

The process capability is the measurement of the capability of the process performed when there are some noise factors and process inputs impacting the process due to which the output of the process could not be in target line and might get deviated from the target. Deviating from the target can put a question on the capability of the process therefore, to check the process capability, we need to perform the process capability test. Therefore, the process would not give the same outputs each time, it will get deviated from its target.

Talking about the process, it is often influenced by many other factors and noises. Process Capability has two parts namely, the process and its capability, which essentially means how capable is the process of satisfying the customer or whether the process is capable enough. The capability is defined as the voice of the customer over the voice of the process. The Process Capability is a measurement of how the process is performing with respect to the desired outcome.

If process spreads as Car B the garage capability will be low, however, if a process is narrowed like C or D we could see that the process is capable to perform as per customer's expectations. The above example shows the capability of the garage, the example itself explains what is the process capability.