What is Process capability?
Process Capability is the strategy to study of capability or the ability of a process. “Process Capability” study answers the key questions like , “Is this process capable enough to meet its objective?” It refers to the capability of any process to produce a defect free product or services when the process is in a phase of statistical control.
Process capability study is useful to appraise the ability of any process to meet the needed specifications. We can judge that how capable is the process in terms of producing output within the specification limit.
There are two methodology of calculating Process Capability:
1. Based on measuring the variability of the process directly.
(the inherent variation within a sample)
2. Based on counting the number of defects produced by the process.
( DMPO or Six sigma )
Phases of Process capability analysis.
A. Bringing the process in a state of statistical control for a given period of time by use of control charts.
B. Comparing to what extent the long-term process performance complies with the management or engineering specifications.
Process capability studies following Six sigma strategy at very initial phase and It also used at the end of a study to check the degree of improvement in the attained state.
It observe and studies the overall capability of a process in ideal conditions over predefine span in Hours or in Days.
Process engineers are responsible resources for the process capability studies. Knowledge of the short term stability and capability at the end is one if the core benefits of this study.
Process performance studies also includes long term performance of a process along with short term study. It determine the long term stability and capability of the process by using the total process variability in the standard capability computations.
In simple words you can get an idea by measurement of efficiency and effectiveness of any process, and its performance with end result or final outcome by this method.