Page 142 - Six Sigma Demystified
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Chapter 6 a n a ly z e S tag e 123
Figure6.1 Pareto approach to setup reduction.
after they have been handed to the customer, then the total cycle time is
reduced. The serial activities of payment and cooking are converted to parallel
activities, reducing the overall cycle time.
There are some internal steps that cannot be done while the process is opera-
tional. Efforts should concentrate on the time required to complete the steps
that delay the process. Here, it is necessary to understand which activities are
on the critical path, as determined using the Gantt chart discussed in Part 3. If
activity times not on the critical path are decreased, there is no subsequent
reduction in total process time.
Adjustments can be reduced through effective process control. Statistical
process control charts and designed experiments may be used to understand
the causes of process variations that precede the adjustment. These causes then
can be eliminated or controlled.
PRojeCt exAmPle:Value-StreamAnalysis
Referring to the as- is (i.e., current state) process map for order processing shown
in Figure 5.1, many of the steps were initially considered business value- added
(BVa), two steps were considered non- value- added, and five steps were consid-
ered value- added.
