In the just-in-time operation, the controlling system begins with the operator. The
operator can use the statistic process control, which involves self-inspection and
gathering data about the process. The statistic process control sets up control
limits for the process to perform within guidelines. This system shows how the
process is performing and calls for corrective actions when defects appear. The
corrective action is taken before many defects appear. In the traditional operation,
several batches may be produced before a defect has been detected