This is an example of a system out of control. Investigation is required to determine why there is so much variation.
“A spike in a chart could also indicate that signals have lost and somehow made their way back into the system all at once”.
“If the customer is not able to avoid batch running an operation, it may be necessary to move the point at which the signal is returned. The signal could be returned after the next operation that runs one day’s worth of parts, each day. This could be do