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Statistical process control throws immense opportunity to understand extent of variation and type of variation. A decision can be of two types depending on the cause being addressed -
1. Special cause: Decisions are local and no major business decisions are really needed! It can really alter cost structure positively in terms of reduced setup time, reduced monitoring frequency, reduced inspection cost and increased efficiency.
2. Common cause: When a process variation is due to common cause and extent of variation (capability of the process) is not acceptable by the customers or the market, key business decisions are necessary. It can be enhancing machine capabilities and investment related it. Some time decision of discontinueing a product may happend if new cost structure does not fit the need of the customer.