Submission Types Discussion Comment Submission & Rubric > Description Variability can be an extremely costly problem. I know of one industry in this area that has a column that produces a product that is very profitable. The product is so valuable that each truckload is $1 million. The column produces three truckloads per hour. That is $72 million every twenty four hrs! | would like to have a share of that. Think of how much it costs the company when that column is not working properly. If the product produced is off-spec, the product must be reworked to be brought in spec and able to sell. Not only do you have the loss of sales, but also the cost of the rework. Many systems have been developed to track, monitor, and correct variability in processes