Control Chart Samole

QUAN 6610
Tool: Control Chart 2
Slide 7Slide 7
Identifying Special Causes of Variation
source: Brian Joiner, Fourth Generation Management, pp. 260.
See also Lean Six Sigma
Pocket Toolbook, p. 133-135.
Slide 8Slide 8
Strategies for Reducing Special Causes of Variation
Get timely data so special causes are signaled
quickly.
Put in place an immediate remedy to contain any
damage.
Search for the cause -- see what was different.
Develop a longer term remedy.
source: Brian Joiner, Fourth Generation Management, pp. 138-139.
Slide 9Slide 9
“In a common cause
situation, there is no such
thing as THE cause.”
Brian Joiner
Slide 10Slide 10
Improving a Stable Process
Stratify -- sort into groups or categories; look for
patterns. (e.g., type of job, day of week, time, weather,
region, employee, product, etc.)
Experiment -- make planned changes and learn from
the effects. (e.g., need to be able to assess and learn
from the results -- use PDCA .)
Disaggregate -- divide the process into component
pieces and manage the pieces. (e.g., making the
elements of a process visible through measurements
and data.)
source: Brian Joiner, Fourth Generation Management, pp. 140-146.
Slide 11Slide 11 Slide 12Slide 12
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