
242 A First Course in Quality Engineering
capable� Therefore, when we know a process is in-control, a further veri-
cation is necessary to check if the process is also capable� If the process
is not capable, then further work is necessary to achieve capability� Such
work is referred to as a “capability study�” There are measures to evaluate
quantitatively the extent to which a process is capable; that is, the extent
to which the output of a process meets the specication� Such measures,
which are known as “process capability indices,” are discussed later in this
chapter�
For now, it should be emphasized that when a process is brought in-con