Interpreting Control Charts
There are patterns or rules that
help us determine whether a process has gone out-of-control.
Western Electric rules.
Five Automotive Industry Action Group (AIAG)
Your company may have rules based on these rules or on the
rules from other organizations.
Both the Western Electric and AIAG
rules cite the need to look for other unnatural or non-random
patterns of variation when interpreting control charts.
action must be taken when one of these patterns develops.
Corrective action includes:
Looking at the Comments section to help
determine why the process has changed, and
Making a correction.