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What is Process Capability?
Process capability compares the process
output with the customerís specification.
The purpose of a process capability study is to compare the
process specification to the process output and determine
statistically if the process can meet the customerís specification.
A capable process is:
Stable and not changing.
Can fit within
the customerís specification with a little extra room (usually 25%)
The less variation there is in a process, the more
capable it will be of meeting the customerís specification.
Capable AND Centered
using process capability as a means for measuring how well our
process is producing compared to the customerís requirements, it is
not good enough to just make sure the process is capable; it must
also be fairly well-centered.