assignable cause
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Cignet Plastics Corporation is a contract plastics die-casting house serving a wide range
of clients. Over the years, Cignet has been a favored supplier of precision die castings for
a major producer of model airplane kits. In recent days the defect rate of these parts has
increased. (Acceptance is based on a visual inspection of the parts for appearance.) After
a thorough audit of the process, Quality Assurance has concluded that there has been no
change to the process. It claims that the increase in defects must be variation that is
related to some assignable cause. The president of Cignet Plastics does not have a clue as
to what that means, and he has called you in for an explanation.
1. What will you tell the president?
2. He wants you to change the process to reduce the number of defects, but you know that is
the wrong approach. How do you talk him out of it?
3. What approach would you use to get the operation back to normal?
â?¢ Why is it important for managers to
o employ process thinking?
o identify at least two quality management tools that could be used to present data and persuade the president? Why would you use these tools to support your arguments?
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Solution Summary
Cignet Plastics Corporation is a contract plastics die-casting house serving a wide range
of clients. Over the years, Cignet has been a favored supplier of precision die castings for
a major producer of model airplane kits.
Solution Preview
First of all, I will explain President about assignable cause that led to increasing number of defects. A particular cause which is fundamental part of a process attributes to assignable cause. It is necessary to thoroughly investigate assignable cause once it is identified and the process should be adjusted accordingly to rectify the variation or error.
Hence, it is not advisable for the president to change the process without identifying and investigating assignable cause for the increasing number of defects. I will explain to president that ...
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