A factory was trying out a new process for producing one of its products, with the goal of reducing productioncosts. A trial production run using the new process showed a 15 percent reduction in costs compared with pastperformance using the standard process. The production managers therefore concluded that the new processdid produce a cost savings.

Which of the following, if true, casts most doubt on the production manager's conclusion?

【选项】Since the new process differs from the standard process only in the way in which the stage of production are organized and ordered, the cost of the materials used in the product is the same in both processes.