Statistical process control includes a set of upcoming
problems solving tools which is useful for creating stability in
the process by decreasing the variability. Control charts are
powerful tools for monitoring manufacturing processes and the
first samples of these type of tools were introduced by
Shewhart who introduced X − R control charts to monitor a
process with continuous specifications. However, the
application of control charts for monitoring continuous data is
defined for situations in which the size of each piece is
precisely determined and the result of measuring process can
be presented as a crisp number.