Experiments are designed and executed in order to illuminate our understanding about a product or process. Characteristics of products and processes are frequently affected by various factors. In an experiment, one or more process variables (or factors) are changed in order to observe the effect the changes have on one or more response variables. Classical experiments focus on varying one factor at a time (0FAT or 1FAT), perhaps at one or two levels, and attempt to hold everything else constant. Observed changes in these characteristics are then recorded for future consideration.
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