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The purpose of this blog is to help fellow students and even average people to get a general idea of process control and some related engineering stuffs. There are a lot of tutorials, course materials, journals, books, and website about process control that are available  in the internet. Thus, the author intend to provide a simple and brief explanation in this blog to serve as a steeping stone in understanding the process control and engineering especially chemical engineering. For further discussion and explanation, the readers are urged to read the original materials.