Handbook For Basic Process Improvement Page 29
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40Handbook for Basic Process Improvement
Step 7: Is the process capable?
Once the process has been
stabilized, the data collected in Step
Plot the data collected in
Step 6
5 is used again. This time the team
Step 5 in a Histogram
plots the individual data points to
produce a bar graph called a
Plot the process
histogram . This tool is explained in
improvement objective
the Basic Tools for Process
as the target value in
Improvement.
the Histogram
To prepare the histogram, the team
superimposes the target value for
Do
Yes
the process on the bar graph. The
Plot specification limits
specification
in the Histogram
limits exist?
target value was established in Step
1 as the process improvement
objective .
No
If there are upper and/or lower
Does the
specification limits for the process,
Histogram’s
No
the team should plot them also.
shape approximate
a
(Note: Specification limits are not the
bell curve?
Are all
same as the upper and lower control
No
data points inside
limits used in control charts.)
the specification
Yes
limits?
Step 8
Once the data, the target value, and
the specification limits (if applicable)
Are the
Yes
data points
No
are plotted, the team can determine
close enough to
whether the process is capable . The
the target?
following questions can be used to
guide the team’s thinking:
Step 8
Yes
Are there any unusual
Step 14
patterns in the plotted data?
Does the bar graph have
multiple tall peaks and steep
valleys? This may be an indication that other processes are influencing the process
the team is investigating.
Do all of the data points fall inside the upper and lower specification limits (if
applicable)? If not, the process is not capable.
If all of the data points fall within the specification limits, are the data grouped
closely enough to the target value?
This is a judgment call by the team. While the
process is capable, the team may not be satisfied with the results it produces. If
25
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