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A pizza company with stores located citywide uses one order call-in phone number for the entire city. Callers, regardless of their address, can phone 888-1111 to place an order. Based on the caller’s phone number, an automated switching service directs the call to the appropriate store. On a recent Friday evening, the pizza company lost as many as 15,000 orders when a malfunctioning mechanical device made calls to their phone number impossible. From about 5:30 to 8 P.M., when callers hoping to place an order phoned, they were met with either silence or a busy signal. This is not the first time this malfunction has occurred. Just two weeks earlier, the same problem surfaced. The pizza company and the company that installed the system are working to ensure that situation doesn’t repeat itself. They believe a defective call switch is to blame. What techniques you learned in the class do you suggest they use to fully investigate their problem? How would they use these techniques and in what way would the techniques you suggested be useful?