Handbook For Basic Process Improvement Page 36
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40Handbook for Basic Process Improvement
Step 12: Is the modified process stable?
Steps 12 and 13 together comprise the
Check phase of the PDCA cycle.
Step 11
The team modified the process based on
the improvement plan and conducted a
Collect the data
test. During the test of the new procedure,
collection sheets
data were collected. Now the team checks
from Step 11
whether the expected results were
achieved.
The procedures in this step are identical to
those in Step 6. The team uses the data
Variables
Use X-Bar and R or
Data
What type
they have collected to check the process
X and Moving
of data was
Range Control Chart
for stability by preparing a control chart or
collected?
or a Run Chart
run chart . Since the process has
changed, it is appropriate to recompute the
Attribute
control limits for the control chart using the
Data
new data.
Use X and Moving
Plot the data on the
If the data collected in Step 11 show that
Range Control Chart
applicable chart
or a Run Chart
process performance is worse, the team
must return to Step 8 and try to improve
the process again. The process must be
stable before the team goes on to the next
step.
Are
Remove the
any of the
The tools the team needs to assess
Yes
change by returning
rules for assessing
whether the changed process is stable are
the process to its
stability
earlier state
explained in the following modules of the
violated?
Basic Tools for Process Improvement :
Module 1:
Operational Definitions
Step 9
No
Module 2:
Brainstorming
Module 6:
Flowchart
Module 7:
Data Collection
Step 13
Module 9:
Run Chart
Module 10: Control Chart
32
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