In class we learned about statistical process control and how it helps a person distinguish between common cause and special cause variation. The example in class where we had to write our name 5 times and then again with the opposite hand was an example of special cause variation. Some kind of an event happened to make our writing look so messy the second time around.
Special cause variation can always be traced to a specific reason. This happens because of unusual circumstances. In order to manage special cause variation, the problem needs to be identified and removed. It is easier to remove special cause than common cause from the system because it can be identified.
Whereas common cause cannot be traced to a specific problem because there are multiple causes contributing to the problem. It affects every outcome, so in order to control common cause variation something in the process needs to be improved. Common cause is inherent in the system. Only management could be blamed for common cause in their system.
These topics made me think about how one little thing can change the way we act, the process time, and the look of something. Writing with my left hand took a lot longer, looked a lot messier, and felt funnier. It would be an identifiable fix if I wanted my writing to look better.
This made me think about how some academic textbooks are written. There are so many incomprehensible concepts that the meaning and the purpose of the article gets lost. We have all had a class where the professor does not teach, but assigns readings, which will be tested on. I believe everyone can interpret readings differently and could get way off base on what the real idea is supposed to be. That is the class where 80% of the students get below a C. The students blame the professor because there is no identifiable cause to why everyone failed. When in reality it is insufficient training.
Then there are the professors that teach the class and give out assignments and questions to make sure students understand the concept. Everyone has the same thought process and understands what the professor wants and what the class entails. The common cause of misinterpretation has turned into a special cause, which can be fixed with proper instructions and understanding.
In this common cause variation, is a professor better than a textbook?