You developed a spreadsheet program that helps you perform your role of inventory control manager at a small retail sports shoe store. The software uses historical sales data to calculate expected weekly sales for each of about 250 shoes carried by the store. Based on that forecast, you order the appropriate shoes from the various manufacturers. Your store is one of four shoe stores owned by the same person. You sent a copy of the spreadsheet to each of the people responsible for inventory control at the other three retail stores, and they are all now using your software to help them do their jobs. You have started getting complaints that the software is not entirely accurate, and you notice that your own estimates are no longer as accurate as they used to be. What would you do?