The
Shepherd: Analyzing the Problem Operation
The Shepherd continues by analyzing Operation 2700 in
more detail. The chart below shows the number of arrivals
to Operation 2700 during each shift. The arrivals are
highly variable.
The Shepherd next looks explicitly at the variability
in the time between arrivals to Operation 2700, as shown
below. Here again, the interarrival times to Operation
2700 are shown to be highly variable. This arrival
variability no doubt contributes to the large number of
inactive lots sometimes found at Operation 2700.
However, the arrival process variability alone is not
sufficient to explain the high variability in the WIP and
inventory age at Operation 2700 (the variation in WIP was
more cyclic than the arrival variability). The Shepherd
investigates further, looking for a root cause. (Go
to the next page.)
|
