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Distributed SPC is both more available and more reliable than centralized SPC.<ref>[http://books.google.com/books?id=ghCiNHzWvL4C&pg=PA96&dq=4.3+Distributed+SPC&hl=en&sa=X&ei=ToAhT6fJAsHL0QHhr4zVCA&ved=0CDIQ6AEwAA#v=onepage&q=4.3%20Distributed%20SPC&f=false] T Wiswanathan</ref>
*Vertical decomposition:
*:Whole exchange is divided into several blocks and a processor is assigned to each block. This processor perform all the task related to that specific blocks. Therefore, the total control system consists of several control units coupled together. For redundancy purpose processor may be duplicated in each blocks.
*Horizontal Decomposition:
*:In this type of decomposition each processor performs only one or some exchange function.
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